purchase vs purchaser

purchase and purchaser both are nouns.

Word	Noun	Adjective	Verb	Adverb
purchase	Yes	No	Yes	No
purchaser	Yes	No	No	No

purchase (noun)	purchaser (noun)
the acquisition of something for payment	a person who buys
the mechanical advantage gained by being in a position to use a lever
a means of exerting influence or gaining advantage
something acquired by purchase

purchase (verb)	purchaser (verb)
obtain by purchase; acquire by means of a financial transaction