bargeman vs Jack-tar

bargeman and Jack-tar both are nouns.

Word	Noun	Adjective	Verb	Adverb
bargeman	Yes	No	No	No
Jack-tar	Yes	No	No	No

As nouns, Jack-tar is a hypernym of bargeman; that is, Jack-tar is a word with a broader meaning than bargeman:

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

bargeman (noun)	Jack-tar (noun)
someone who operates a barge	a man who serves as a sailor