drug dealer vs drug trafficker

drug dealer and drug trafficker both are nouns.

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

As nouns, drug dealer and drug trafficker are synonyms defined as:

Other synonyms of drug dealer include drug peddler, peddler, pusher.

drug dealer (noun)	drug trafficker (noun)
an unlicensed dealer in illegal drugs	an unlicensed dealer in illegal drugs