encrustation vs tartar

encrustation and tartar both are nouns.

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

As nouns, tartar is a hyponym of encrustation; that is, tartar is a word with a more specific, narrower meaning than encrustation:

Other hyponyms of encrustation include calculus, tophus.

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