Viagra vs virility drug

Viagra and virility drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
Viagra	Yes	No	No	No
virility drug	Yes	No	No	No

As nouns, virility drug is a hypernym of Viagra; that is, virility drug is a word with a broader meaning than Viagra:

Viagra: virility drug (trade name Viagra) used to treat erectile dysfunction in men
virility drug: drug to treat impotence attributable to erectile dysfunction

Other hypernyms of Viagra include anti-impotence drug.

Viagra (noun)	virility drug (noun)
virility drug (trade name Viagra) used to treat erectile dysfunction in men	drug to treat impotence attributable to erectile dysfunction