tartar vs potassium hydrogen tartrate

tartar and potassium hydrogen tartrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
tartar	Yes	No	No	No
potassium hydrogen tartrate	Yes	No	No	No

As nouns, tartar and potassium hydrogen tartrate are synonyms defined as:

tartar and potassium hydrogen tartrate: a salt used especially in baking powder

Other synonyms of tartar include cream of tartar, potassium bitartrate.

tartar (noun)	potassium hydrogen tartrate (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