sailing vs bitter end

sailing and bitter end both are nouns.

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

sailing (noun)	bitter end (noun)
riding in a sailboat	(nautical) the inboard end of a line or cable especially the end that is wound around a bitt
the work of a sailor	the final extremity (however unpleasant it may be)
the departure of a vessel from a port
the activity of flying a glider