Rohypnol vs R-2

Rohypnol and R-2 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rohypnol	Yes	No	No	No
R-2	Yes	No	No	No

As nouns, R-2 is a hyponym of Rohypnol; that is, R-2 is a word with a more specific, narrower meaning than Rohypnol:

Rohypnol: a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia
R-2: street names for flunitrazepam

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

Rohypnol (noun)	R-2 (noun)
a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia	street names for flunitrazepam