buy vs select

buy is a noun but select is not a noun.

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

buy (noun)	select (noun)
an advantageous purchase

buy (adjective)	select (adjective)
	selected or chosen for special qualifications
	of superior grade

buy (verb)	select (verb)
accept as true	pick out, select, or choose from a number of alternatives
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