mercer vs monger

mercer and monger both are nouns.

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

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

mercer: a dealer in textiles (especially silks)
monger: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of mercer include bargainer, dealer, trader.

mercer (noun)	monger (noun)
a dealer in textiles (especially silks)	someone who purchases and maintains an inventory of goods to be sold

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