slang vs dupe

slang and dupe both are nouns.

Word	Noun	Adjective	Verb	Adverb
slang	Yes	No	Yes	No
dupe	Yes	No	Yes	No

As verbs, slang and dupe are synonyms defined as:

Other synonyms of slang include befool, cod, fool, gull, put on, put one across, put one over, take in.

slang (noun)	dupe (noun)
a characteristic language of a particular group (as among thieves)	a person who is tricked or swindled
informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar