buy vs bargain

buy and bargain both are nouns.

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

As nouns, buy and bargain are synonyms defined as:

Other synonyms of buy include steal.

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

buy (verb)	bargain (verb)
accept as true	come to terms; arrive at an agreement
obtain by purchase; acquire by means of a financial transaction	negotiate the terms of an exchange
make illegal payments to in exchange for favors or influence
acquire by trade or sacrifice or exchange
be worth or be capable of buying