horse trader vs bargainer

horse trader and bargainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse trader	Yes	No	No	No
bargainer	Yes	No	No	No

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

horse trader: a hard bargainer
bargainer: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of horse trader include dealer, monger, trader.

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