dealer vs bibliopole

dealer and bibliopole both are nouns.

Word	Noun	Adjective	Verb	Adverb
dealer	Yes	No	No	No
bibliopole	Yes	No	No	No

As nouns, bibliopole is a hyponym of dealer; that is, bibliopole is a word with a more specific, narrower meaning than dealer:

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

dealer (noun)	bibliopole (noun)
a firm engaged in trading	a dealer in secondhand books (especially rare or curious books)
a seller of illicit goods
the person who distributes the playing cards in a card game
someone who purchases and maintains an inventory of goods to be sold
the major party to a financial transaction at a stock exchange; buys and sells for his own account