bargain vs buy

bargain and buy both are nouns.

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

As nouns, bargain and buy are synonyms defined as:

Other synonyms of bargain include steal.

bargain (noun)	buy (noun)
an agreement between parties (usually arrived at after discussion) fixing obligations of each	an advantageous purchase
an advantageous purchase

bargain (verb)	buy (verb)
come to terms; arrive at an agreement	accept as true
negotiate the terms of an exchange	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