dealer vs barterer

dealer and barterer both are nouns.

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

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

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

dealer (noun)	barterer (noun)
a firm engaged in trading	a trader who exchanges goods and not money
a seller of illicit goods
the person who distributes the playing cards in a card game
someone who purchases and maintains an inventory of goods to be sold
the major party to a financial transaction at a stock exchange; buys and sells for his own account