slummy vs slum

slummy is not a noun while slum is a noun.

Word	Noun	Adjective	Verb	Adverb
slummy	No	Yes	No	No
slum	Yes	No	Yes	No

slummy (noun)	slum (noun)
	a district of a city marked by poverty and inferior living conditions

slummy (adjective)	slum (adjective)
(of housing or residential areas) indicative of poverty

slummy (verb)	slum (verb)
	spend time at a lower socio-economic level than one's own, motivated by curiosity or desire for adventure; usage considered condescending and insensitive