slang vs street name

slang and street name both are nouns.

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

As nouns, street name is a hyponym of slang; that is, street name is a word with a more specific, narrower meaning than slang:

Other hyponyms of slang include rhyming slang.

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