bosun vs gob

bosun and gob both are nouns.

Word	Noun	Adjective	Verb	Adverb
bosun	Yes	No	No	No
gob	Yes	No	No	No

As nouns, gob is a hypernym of bosun; that is, gob is a word with a broader meaning than bosun:

bosun: a petty officer on a merchant ship who controls the work of other seamen
gob: a man who serves as a sailor

Other hypernyms of bosun include Jack-tar, Jack, mariner, old salt, sea dog, seafarer, seaman, tar.

bosun (noun)	gob (noun)
a petty officer on a merchant ship who controls the work of other seamen	informal terms for the mouth
	a lump of slimy stuff
	a man who serves as a sailor