bo's'n vs seafarer

bo's'n and seafarer both are nouns.

Word	Noun	Adjective	Verb	Adverb
bo's'n	Yes	No	No	No
seafarer	Yes	No	No	No

As nouns, seafarer is a hypernym of bo's'n; that is, seafarer is a word with a broader meaning than bo's'n:

bo's'n: a petty officer on a merchant ship who controls the work of other seamen
seafarer: a man who serves as a sailor

Other hypernyms of bo's'n include gob, Jack-tar, Jack, mariner, old salt, sea dog, seaman, tar.

bo's'n (noun)	seafarer (noun)
a petty officer on a merchant ship who controls the work of other seamen	a man who serves as a sailor