commerce vs purchase

commerce and purchase both are nouns.

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

commerce (noun)	purchase (noun)
transactions (sales and purchases) having the objective of supplying commodities (goods and services)	the acquisition of something for payment
social exchange, especially of opinions, attitudes, etc.	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

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