able seaman vs tar

able seaman and tar both are nouns.

Word	Noun	Adjective	Verb	Adverb
able seaman	Yes	No	No	No
tar	Yes	No	Yes	No

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

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

able seaman (noun)	tar (noun)
a seaman in the merchant marine; trained in special skills	a man who serves as a sailor
	any of various dark heavy viscid substances obtained as a residue

able seaman (verb)	tar (verb)
	coat with tar