do by vs treat

do by is not a noun while treat is a noun.

Word	Noun	Adjective	Verb	Adverb
do by	No	No	Yes	No
treat	Yes	No	Yes	No

As verbs, do by and treat are synonyms defined as:

Other synonyms of do by include handle.

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

do by (verb)	treat (verb)
interact in a certain way	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