tartar vs cream of tartar

tartar and cream of tartar both are nouns.

Word	Noun	Adjective	Verb	Adverb
tartar	Yes	No	No	No
cream of tartar	Yes	No	No	No

As nouns, tartar and cream of tartar are synonyms defined as:

Other synonyms of tartar include potassium bitartrate, potassium hydrogen tartrate.

tartar (noun)	cream of tartar (noun)
an incrustation that forms on the teeth and gums	a salt used especially in baking powder
a fiercely vigilant and unpleasant woman
a salt used especially in baking powder