OK this really didn't take too long but I found a list that may help you out.
It came from a WW2 rate list on
USS ENTERPRISE CV6Enlisted Mens' RatingsRating Abbreviation Duties Aerographer's Mate AerM Make weather observations. Read weather codes and signals.
Airship Rigger AR Control and moor airships. Know steering and meteorology.
Apprentice Seaman AS Know naval drill duties, tie knots. Stand watch.
Aviation Chief Radioman ACRM
Aviation Electrician's Mate AEM Inspect, maintain, repair and install all electrical equipment in aircraft.
Aviation Machinist's Mate AMM Assemble, service and repair airplanes and airplane engines. Splice aircraftwiring. Know principles and theory of flying.
Aviation Machinist's Mate C AMMC Aviation carburetor mechanic.
Aviation Machinist's Mate F AMMF Aviation flight engineer.
Aviation Machinist's Mate H AMMH Aviation hydraulic mechanic.
Aviation Machinist's Mate I AMMI Aviation instrument mechanic.
Aviation Machinist's Mate P AMMP Aviation propeller mechanic.
Aviation Metalsmith AM Repair airplane metal parts. Know principles and theory of flying.
Aviation Ordnanceman AOM Handle and take care of all aviation weapons.
Aviation Ordnanceman B AOMB Aviation bombsight mechanic.
Aviation Ordnanceman T AOMT Aviation turret mechanic.
Aviation Pilot AP Pilot planes and airships. Serve as plane captain.
Aviation Radio Technician ART Maintain all aviation radio equipment.
Aviation Radioman ARM Operate radio transmitting and receiving equipment of naval aircraft.
Baker Bkr Operate ovens. Do any kind of baking.
Boatswain's Mate BM Work with canvas and hoisting with block and tackle. Handle rope, wire, and anchor chain. Handle power and sail boats. Steer ship and chart courses. Direct salvage.
Boatswain's Mate A BMA Same duties as Boatswain's Mate and in addition, Master-at-arms.
Boilermaker B Fit pipes, make repairs in boilers. Know construction of marine boilers and fireroom safety precautions.
Buglemaster Bgmstr Know all bugle and drum calls and honors rendered. Lead and instruct a corps.
Bugler Bug Play in a bugle and drum corps. Know bugle calls and honors.
Carpenter's Mate CM Use hand and power tools. Take charge of ship ventilation, painting, watertight control, drainage. Understand shoring and drydocking.
Chief Commissary Steward CCS Supervise ship's galley.
Chief Photographer CP
Chief Watertender CWT
Commissary Steward CS
Cook Ck Take charge of galley.
Coxswain COX Work with canvas and handle boats. Know signaling.
Electrician's Mate EM Use electrical tools and repair electrical equipment. Charge storage batteries. Wind armatures. Stand watch on main gyrocompass and in main control room of electrically driven ships. Repair telephone circuits. Apply first aid in case of electrical shock.
Fire Controlman FC Stow, inspect and repair fire control instruments. Take charge of fire control equipment. Know electricity - A.C. and D.C. Man fire control stations.
Fire Controlman R FCR Same duties as fire controlman and in addition, range finder operator.
Fire Controlman S FCS Submarine fire controlman.
Fireman F Fire and tend boilers. Operate, adjust and repair pumps.
Gunner's Mate GM Take charge of gun and crew. Assemble and fire all types of guns. Handle ammunition. Handle mines and depth charges.
Hospital Apprentice HA Know minor surgery, first aid and nursing. Maintain sanitary conditions.
Machinist MACH
Machinist's Mate MM Operate main and auxiliary engines. Adjust, repair, and overhaul engines. Be familiar with ship's drainage systems, distilling plants, evaporators and pumps.
Machinist's Mate E MME Engineman.
Machinist's Mate G MMG Industrial gas generator mechanic.
Machinist's Mate R MMR Refrigeration mechanic.
Machinist's Mate S MMS Shop machinist.
Mess Attendant MATT
Metalsmith M Make plans, time and cost estimates. Work in copper and brass. Temper metals, repair damage. Test for watertightness.
Mineman MN Carry and move mine cases, anchors, cables, lines, buoys.
Molder ML Equip and work in foundry. Make castings. Use molding tools. Operate oil furnaces.
Motor Machinist's Mate MoMM Operate machine tools. Operate and maintain internal combustion engines and engine auxiliaries. Knowledge of pressure and air systems. Be familiar with electrical apparatus.
Musician Mus Play standard band music. Read music at sight.
Officer's Cook OC
Painter Ptr Prepare and apply paints and varnishes. Lay and repair tiling and linoleum. Take charge of and repair fire extinguisher and rescue breathing apparatus.
Painter V PtrV Aviation painter.
Parachute Rigger PR Pack and repair parachutes. Parachute jumping experience.
Patternmaker PM Use pattern and molding tools. Execute intricate patterns.
Pharmacist's Mate PhM Take charge of sick bay. Do minor surgery and administer simple medicines.
Photographer's Mate PhoM Organize and direct operations of Naval photographic units. Operate motion picture machines. Develop negatives and make prints.
Printer Prtr Take charge of ship's printshop, set type. Read proof.
Printer L PrtrL Lithographer.
Printer M PrtrM Multilith operator.
Quartermaster QM Steer ship and take soundings. Use range finder. Plot bearings. Know signal control and navigation. Send and receive International Code by blinker, searchlight and semaphore.
Radarman RdM Stand radar watch and operate radar equipment.
Radio Electrician RE
Radio Technician RT Maintain radio equipment.
Radioman RM Transmit and receive radio messages. Encipher and decipher messages.
Seaman S Know naval drill duties, knots, steering and signaling. Stand watch and gunnery duties.
Ship's Cook SC Supervise and prepare cooking.
Ship's Cook B SCB Butcher.
Ship's Service Man B SSMB Barber.
Ship's Service Man C SSMC Cobbler.
Ship's Service Man L SSML Laundryman.
Ship's Service Man T SSMT Tailor.
Shipfitter SF Use hand and machine tools for steel metal work. Bend, repair and fit pipes. Operate fire extinguishers and rescue breathing apparatus.
Signalman SM Stand signal watch on bridge. Identify flags. Use blinker, searchlight and semaphore. Use range finder, searchlights, signal apparatus.
Sonarman SoM Operate special sound equipment.
Sonarman H SoMH Operate special harbor sound equipment.
Special Artificer D SAD Knowledge and repair of special training devices.
Special Artificer I SAI Repair typewriters and watches. Coat lenses of optical instruments.
Special Artificer O SAO Repair all optical instruments, such as telescopes, periscopes, compasses, range finders.
Specialist A Sp(A) Athletic instructor.
Specialist C Sp(C) Classification interviewer.
Specialist F Sp(F) Fire fighter.
Specialist G Sp(G) Aviation free gunnery instructor.
Specialist I Sp(I) Punched card accounting machine operator and mechanic.
Specialist M Sp(M) Mail clerk.
Specialist O Sp(O) Inspector of Naval material.
Specialist P Sp(P) Photographic specialist.
Specialist P (LB) Sp(P)(LB) Laboratory.
Specialist P (MP) Sp(P)(MP) Motion picture production.
Specialist P (PG) Sp(P)(PG) Photogrammetry.
Specialist P (VM) Sp(P)(VM) V-mail.
Specialist Q Sp(Q) Communication specialist.
Specialist Q (CR) Sp(Q)(CR) Cryptographer.
Specialist Q (IN) Sp(Q)(IN) Radio Intelligence.
Specialist Q (TE) Sp(Q)(TE) Technicians.
Specialist R Sp(R) Recruiter.
Specialist S Sp(S) Shore patrol. Master-at-arms.
Specialist T Sp(T) Teacher.
Specialist T (LT) Sp(T)(LT) Link Trainer Instructor.
Specialist U Sp(U) Supervisor of WAVE quarters.
Specialist V Sp(V) Transport airman.
Specialist W Sp(W) Chaplain's assistant.
Specialist X Sp(X) Specialists not elsewhere classified.
Specialist X (CT) Sp(X)(CT) Cartographer.
Specialist X (ED) Sp(X)(ED) Engineering draftsman.
Specialist X (PI) Sp(X)(PI) Pigeon trainer.
Specialist X (PL) Sp(X)(PL) Plastic expert.
Specialist X (QM) Sp(X)(QM) Operation - plotting and chart work.
Specialist X (SB) Sp(X)(SB) Telephone switchboard operator supervisors.
Specialist X (TD) Sp(X)(TD) Topographical draftsman.
Specialist X (TS) Sp(X)(TS) Air stations operations desk (time shack).
Specialist X (VA) Sp(X)(VA) Visual training aids.
Specialist Y Sp(Y) Control tower operator.
Steward St Take charge of mess arrangements.
Steward's Mate StM Serve at table in officers' mess.
Storekeeper SK Take charge of ship's storeroom. Issue and account for stock and clothing.
Storekeeper D SKD Disbursing storekeeper.
Storekeeper T SKT Handle technical stock material.
Storekeeper V SKV Aviation storekeeper.
Telegrapher T Send and receive cables.
Torpedoman's Mate TM Lubricate, assemble, charge and fire torpedoes. Lay mines and drop depth charges.
Torpedoman's Mate E TME Torpedoman's mate, electrical.
Torpedoman's Mate V TMV Torpedoman's mate assigned to aviation activities.
Turret Captain TC Take charge of gun turret and crew. Assemble and repair guns. Handle ammunition. Operate periscopes and range finders.
Warrant Officer WO
Water Tender WT Take charge of fireroom when under way. Maintain, repair, and overhaul boiler system.
Yeoman Y Take charge of ship's office. Take dictation, write Navy letters. Prepare reports and keep personnel records.