plow vs do by

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

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

plow (noun)	do by (noun)
a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

plow (verb)	do by (verb)
act on verbally or in some form of artistic expression	interact in a certain way
to break and turn over earth especially with a plow
move in a way resembling that of a plow cutting into or going through the soil