treat vs do by

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

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

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

Other synonyms of treat include handle.

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

treat (verb)	do by (verb)
provide treatment for	interact in a certain way
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