Vioxx vs rofecoxib

Vioxx and rofecoxib both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vioxx	Yes	No	No	No
rofecoxib	Yes	No	No	No

As nouns, Vioxx and rofecoxib are synonyms defined as:

Vioxx and rofecoxib: a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004

Vioxx (noun)	rofecoxib (noun)
a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004	a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004