art dealer vs monger

art dealer and monger both are nouns.

Word	Noun	Adjective	Verb	Adverb
art dealer	Yes	No	No	No
monger	Yes	No	Yes	No

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

art dealer: a dealer in works of art requiring esthetic evaluation
monger: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of art dealer include bargainer, dealer, trader.

art dealer (noun)	monger (noun)
a dealer in works of art requiring esthetic evaluation	someone who purchases and maintains an inventory of goods to be sold

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