able-bodied seaman vs seaman

able-bodied seaman and seaman both are nouns.

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

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

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

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

able-bodied seaman (noun)	seaman (noun)
a seaman in the merchant marine; trained in special skills	a man who serves as a sailor