barterer vs monger

barterer and monger both are nouns.

Word	Noun	Adjective	Verb	Adverb
barterer	Yes	No	No	No
monger	Yes	No	Yes	No

As nouns, monger is a hypernym of barterer; that is, monger is a word with a broader meaning than barterer:

barterer: a trader who exchanges goods and not money
monger: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of barterer include bargainer, dealer, trader.

barterer (noun)	monger (noun)
a trader who exchanges goods and not money	someone who purchases and maintains an inventory of goods to be sold

barterer (verb)	monger (verb)
	sell or offer for sale from place to place