pusher vs dealer

pusher and dealer both are nouns.

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

As nouns, dealer is a hypernym of pusher; that is, dealer is a word with a broader meaning than pusher:

Other hypernyms of pusher include criminal, crook, felon, malefactor, outlaw.

pusher (noun)	dealer (noun)
a small vehicle with four wheels in which a baby or child is pushed around	a firm engaged in trading
a sandal attached to the foot by a thong over the toes	a seller of illicit goods
someone who pushes	the person who distributes the playing cards in a card game
an unlicensed dealer in illegal drugs	someone who purchases and maintains an inventory of goods to be sold
one who intrudes or pushes himself forward	the major party to a financial transaction at a stock exchange; buys and sells for his own account