bargainer vs ironmonger

bargainer and ironmonger both are nouns.

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

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

bargainer: someone who purchases and maintains an inventory of goods to be sold
ironmonger: someone who sells hardware

bargainer (noun)	ironmonger (noun)
someone who purchases and maintains an inventory of goods to be sold	a store selling hardware
negotiator of the terms of a transaction	someone who sells hardware