tophus vs chalkstone

tophus and chalkstone both are nouns.

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

As nouns, tophus and chalkstone are synonyms defined as:

tophus and chalkstone: a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout

tophus (noun)	chalkstone (noun)
an incrustation that forms on the teeth and gums	a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout
a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout