slave dealer vs slave trader

slave dealer and slave trader both are nouns.

Word	Noun	Adjective	Verb	Adverb
slave dealer	Yes	No	No	No
slave trader	Yes	No	No	No

As nouns, slave dealer and slave trader are synonyms defined as:

Other synonyms of slave dealer include slaver.

slave dealer (noun)	slave trader (noun)
a person engaged in slave trade	a person engaged in slave trade