handle vs do by

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

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

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

Other synonyms of handle include treat.

handle (noun)	do by (noun)
the appendage to an object that is designed to be held in order to use or move it

handle (verb)	do by (verb)
act on verbally or in some form of artistic expression	interact in a certain way
touch, lift, or hold with the hands
handle effectively
show and train
be in charge of, act on, or dispose of
interact in a certain way