Mexican valium vs R-2

Mexican valium and R-2 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mexican valium	Yes	No	No	No
R-2	Yes	No	No	No

As nouns, Mexican valium and R-2 are synonyms defined as:

Other synonyms of Mexican valium include circle, forget me drug, roach, roofy, rope, rophy.

Mexican valium (noun)	R-2 (noun)
street names for flunitrazepam	street names for flunitrazepam