dealer vs drug peddler

dealer and drug peddler both are nouns.

Word	Noun	Adjective	Verb	Adverb
dealer	Yes	No	No	No
drug peddler	Yes	No	No	No

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

Other hyponyms of dealer include drug dealer, drug trafficker, peddler, pusher.

dealer (noun)	drug peddler (noun)
a firm engaged in trading	an unlicensed dealer in illegal drugs
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