seafaring vs bitter end

seafaring and bitter end both are nouns.

Word	Noun	Adjective	Verb	Adverb
seafaring	Yes	Yes	No	No
bitter end	Yes	No	No	No

seafaring (noun)	bitter end (noun)
the work of a sailor	(nautical) the inboard end of a line or cable especially the end that is wound around a bitt
travel by water	the final extremity (however unpleasant it may be)

seafaring (adjective)	bitter end (adjective)
used on the high seas