Viagra vs sildenafil citrate

Viagra and sildenafil citrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
Viagra	Yes	No	No	No
sildenafil citrate	Yes	No	No	No

As nouns, Viagra and sildenafil citrate are synonyms defined as:

Viagra and sildenafil citrate: virility drug (trade name Viagra) used to treat erectile dysfunction in men

Other synonyms of Viagra include sildenafil.

Viagra (noun)	sildenafil citrate (noun)
virility drug (trade name Viagra) used to treat erectile dysfunction in men	virility drug (trade name Viagra) used to treat erectile dysfunction in men