slave trade vs slave traffic

slave trade and slave traffic both are nouns.

Word	Noun	Adjective	Verb	Adverb
slave trade	Yes	No	No	No
slave traffic	Yes	No	No	No

As nouns, slave trade and slave traffic are synonyms defined as:

slave trade and slave traffic: traffic in slaves; especially in Black Africans transported to America in the 16th to 19th centuries

slave trade (noun)	slave traffic (noun)
traffic in slaves; especially in Black Africans transported to America in the 16th to 19th centuries	traffic in slaves; especially in Black Africans transported to America in the 16th to 19th centuries