helmsman vs seafarer

helmsman and seafarer both are nouns.

Word	Noun	Adjective	Verb	Adverb
helmsman	Yes	No	No	No
seafarer	Yes	No	No	No

As nouns, seafarer is a hypernym of helmsman; that is, seafarer is a word with a broader meaning than helmsman:

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

helmsman (noun)	seafarer (noun)
the person who steers a ship	a man who serves as a sailor