tartar vs tophus

tartar and tophus both are nouns.

Word	Noun	Adjective	Verb	Adverb
tartar	Yes	No	No	No
tophus	Yes	No	No	No

As nouns, tartar and tophus are synonyms defined as:

Other synonyms of tartar include calculus.

tartar (noun)	tophus (noun)
an incrustation that forms on the teeth and gums	an incrustation that forms on the teeth and gums
a fiercely vigilant and unpleasant woman	a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout
a salt used especially in baking powder