select vs buy

select is not a noun while buy is a noun.

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

select (noun)	buy (noun)
	an advantageous purchase

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

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