bargain vs haggle

bargain and haggle both are nouns.

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

As verbs, haggle is a hyponym of bargain; that is, haggle is a word with a more specific, narrower meaning than bargain:

Other hyponyms of bargain include chaffer, higgle, huckster.

bargain (noun)	haggle (noun)
an agreement between parties (usually arrived at after discussion) fixing obligations of each	an instance of intense argument (as in bargaining)
an advantageous purchase

bargain (verb)	haggle (verb)
come to terms; arrive at an agreement	wrangle (over a price, terms of an agreement, etc.)
negotiate the terms of an exchange