able-bodied seaman vs gob

able-bodied seaman and gob both are nouns.

Word	Noun	Adjective	Verb	Adverb
able-bodied seaman	Yes	No	No	No
gob	Yes	No	No	No

As nouns, gob is a hypernym of able-bodied seaman; that is, gob is a word with a broader meaning than able-bodied seaman:

able-bodied seaman: a seaman in the merchant marine; trained in special skills
gob: a man who serves as a sailor

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

able-bodied seaman (noun)	gob (noun)
a seaman in the merchant marine; trained in special skills	informal terms for the mouth
	a lump of slimy stuff
	a man who serves as a sailor