street name vs slang

street name and slang both are nouns.

Word	Noun	Adjective	Verb	Adverb
street name	Yes	No	No	No
slang	Yes	No	Yes	No

As nouns, slang is a hypernym of street name; that is, slang is a word with a broader meaning than street name:

Other hypernyms of street name include name, argot, cant, jargon, lingo, patois, vernacular.

street name (noun)	slang (noun)
the name of a street	a characteristic language of a particular group (as among thieves)
the name of a brokerage firm in which stock is held on behalf of a customer	informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar
slang for something (especially for an illegal drug)
an alternative name that a person chooses or is given (especially in inner city neighborhoods)