mistreat vs treat

mistreat is not a noun while treat is a noun.

Word	Noun	Adjective	Verb	Adverb
mistreat	No	No	Yes	No
treat	Yes	No	Yes	No

As verbs, treat is a hypernym of mistreat; that is, treat is a word with a broader meaning than mistreat:

Other hypernyms of mistreat include do by, handle.

mistreat (noun)	treat (noun)
	an occurrence that causes special pleasure or delight
	something considered choice to eat

mistreat (verb)	treat (verb)
treat badly	provide treatment for
	subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition
	regard or consider in a specific way
	act on verbally or in some form of artistic expression
	engage in negotiations in order to reach an agreement
	provide with choice or abundant food or drink
	provide with a gift or entertainment
	interact in a certain way