stamp dealer vs monger

stamp dealer and monger both are nouns.

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

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

stamp dealer: a dealer in stamps (whose customers are stamp collectors)
monger: someone who purchases and maintains an inventory of goods to be sold

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

stamp dealer (noun)	monger (noun)
a dealer in stamps (whose customers are stamp collectors)	someone who purchases and maintains an inventory of goods to be sold

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