boatswain vs tar

boatswain and tar both are nouns.

Word	Noun	Adjective	Verb	Adverb
boatswain	Yes	No	No	No
tar	Yes	No	Yes	No

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

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

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

boatswain (noun)	tar (noun)
a petty officer on a merchant ship who controls the work of other seamen	a man who serves as a sailor
	any of various dark heavy viscid substances obtained as a residue

boatswain (verb)	tar (verb)
	coat with tar