financial gain vs win

financial gain and win both are nouns.

Word	Noun	Adjective	Verb	Adverb
financial gain	Yes	No	No	No
win	Yes	No	Yes	No

As nouns, win is a hyponym of financial gain; that is, win is a word with a more specific, narrower meaning than financial gain:

Other hyponyms of financial gain include income, profits, winnings, unearned increment, capital gain.

financial gain (noun)	win (noun)
the amount of monetary gain	a victory (as in a race or other competition)
	something won (especially money)

financial gain (verb)	win (verb)
	be the winner in a contest or competition; be victorious
	obtain advantages, such as points, etc.
	win something through one's efforts
	acquire or deserve by one's efforts or actions
	attain success or reach a desired goal