bibliopolist vs monger

bibliopolist and monger both are nouns.

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

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

bibliopolist: a dealer in secondhand books (especially rare or curious books)
monger: someone who purchases and maintains an inventory of goods to be sold

Other hypernyms of bibliopolist include bargainer, dealer, trader.

bibliopolist (noun)	monger (noun)
a dealer in secondhand books (especially rare or curious books)	someone who purchases and maintains an inventory of goods to be sold

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