monger vs merchandiser

monger and merchandiser both are nouns.

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

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

monger: someone who purchases and maintains an inventory of goods to be sold
merchandiser: a businessperson engaged in retail trade

Other hypernyms of monger include merchant.

monger (noun)	merchandiser (noun)
someone who purchases and maintains an inventory of goods to be sold	a businessperson engaged in retail trade

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