shop vs buy

shop and buy both are nouns.

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

shop (noun)	buy (noun)
a course of instruction in a trade (as carpentry or electricity)	an advantageous purchase
a mercantile establishment for the retail sale of goods or services
small workplace where handcrafts or manufacturing are done

shop (verb)	buy (verb)
give away information about somebody	accept as true
do one's shopping	obtain by purchase; acquire by means of a financial transaction
shop around; not necessarily buying	make illegal payments to in exchange for favors or influence
do one's shopping at; do business with; be a customer or client of	acquire by trade or sacrifice or exchange
	be worth or be capable of buying