coxswain vs steerer

coxswain and steerer both are nouns.

Word	Noun	Adjective	Verb	Adverb
coxswain	Yes	No	No	No
steerer	Yes	No	No	No

As nouns, steerer is a hypernym of coxswain; that is, steerer is a word with a broader meaning than coxswain:

Other hypernyms of coxswain include helmsman, steersman.

coxswain (noun)	steerer (noun)
the helmsman of a ship's boat or a racing crew	a beguiler who leads someone into danger (usually as part of a plot)
	the person who steers a ship