bargainer vs negotiant

bargainer and negotiant both are nouns.

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

As nouns, negotiant is a hypernym of bargainer; that is, negotiant is a word with a broader meaning than bargainer:

bargainer: negotiator of the terms of a transaction
negotiant: someone who negotiates (confers with others in order to reach a settlement)

Other hypernyms of bargainer include negotiator, treater.

bargainer (noun)	negotiant (noun)
someone who purchases and maintains an inventory of goods to be sold	someone who negotiates (confers with others in order to reach a settlement)
negotiator of the terms of a transaction