bargainer vs haggler

bargainer and haggler both are nouns.

Word	Noun	Adjective	Verb	Adverb
bargainer	Yes	No	No	No
haggler	Yes	No	No	No

As nouns, haggler is a hyponym of bargainer; that is, haggler is a word with a more specific, narrower meaning than bargainer:

bargainer (noun)	haggler (noun)
someone who purchases and maintains an inventory of goods to be sold	an intense bargainer
negotiator of the terms of a transaction