buy vs commerce

buy and commerce both are nouns.

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

buy (noun)	commerce (noun)
an advantageous purchase	transactions (sales and purchases) having the objective of supplying commodities (goods and services)
	social exchange, especially of opinions, attitudes, etc.

buy (verb)	commerce (verb)
accept as true
obtain by purchase; acquire by means of a financial transaction
make illegal payments to in exchange for favors or influence
acquire by trade or sacrifice or exchange
be worth or be capable of buying