Hmm, I think you want job titles by profession? But afaik the RN organises itself by command chain and rank.

So Royal Marines Band Service (because it has the simplest structure), apart from officer ranks, only rly has two professions: Royal Marines Musician, and Royal Marines Bugler. Although specialisations do show in the job titles of higher ranks: Principal Director of Music Royal Marines is a Lieutenant Colonel, Corps Bandmaster is a Warrant Officer 1, Corps Bugle Major is a WO2, Corps Drum Major is a WO1, &c.