tartar vs incrustation

tartar and incrustation both are nouns.

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

As nouns, incrustation is a hypernym of tartar; that is, incrustation is a word with a broader meaning than tartar:

Other hypernyms of tartar include crust, encrustation.

tartar (noun)	incrustation (noun)
an incrustation that forms on the teeth and gums	a decorative coating of contrasting material that is applied to a surface as an inlay or overlay
a fiercely vigilant and unpleasant woman	a hard outer layer that covers something
a salt used especially in baking powder	the formation of a crust