virility drug vs Viagra

virility drug and Viagra both are nouns.

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

As nouns, Viagra is a hyponym of virility drug; that is, Viagra is a word with a more specific, narrower meaning than virility drug:

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

Other hyponyms of virility drug include phentolamine, Vasomax, sildenafil, sildenafil citrate, Cialis, tadalafil, Levitra, vardenafil.

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