rubbish vs slang

rubbish and slang both are nouns.

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

rubbish (noun)	slang (noun)
nonsensical talk or writing	a characteristic language of a particular group (as among thieves)
worthless material that is to be disposed of	informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar