slang vs slangy

slang is a noun but slangy is not a noun.

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

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

slang (adjective)	slangy (adjective)
	constituting or expressed in slang or given to the use of slang