purchase vs check out

purchase is a noun but check out is not a noun.

Word	Noun	Adjective	Verb	Adverb
purchase	Yes	No	Yes	No
check out	No	No	Yes	No

purchase (noun)	check out (noun)
the acquisition of something for payment
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)	check out (verb)
obtain by purchase; acquire by means of a financial transaction	examine so as to determine accuracy, quality, or condition
	announce one's departure from a hotel
	try to learn someone's opinions and intentions
	record, add up, and receive payment for items purchased
	withdraw money by writing a check
	trace
	be verified or confirmed; pass inspection