gain vs profiteer

gain and profiteer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gain	Yes	No	Yes	No
profiteer	Yes	No	Yes	No

As verbs, profiteer is a hyponym of gain; that is, profiteer is a word with a more specific, narrower meaning than gain:

gain: derive a benefit from
profiteer: make an unreasonable profit, as on the sale of difficult to obtain goods

Other hyponyms of gain include cash in on, capitalise, capitalize, take advantage, pyramid, clear, net, sack, sack up.

gain (noun)	profiteer (noun)
the amount of increase in signal power or voltage or current expressed as the ratio of output to input	someone who makes excessive profit (especially on goods in short supply)
the advantageous quality of being beneficial
the amount by which the revenue of a business exceeds its cost of operating
a quantity that is added

gain (verb)	profiteer (verb)
increase (one's body weight)	make an unreasonable profit, as on the sale of difficult to obtain goods
rise in rate or price
increase or develop
obtain advantages, such as points, etc.
reach a destination, either real or abstract
earn on some commercial or business transaction; earn as salary or wages
win something through one's efforts
derive a benefit from
obtain