do by vs plow

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

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

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

do by (verb)	plow (verb)
interact in a certain way	act on verbally or in some form of artistic expression
	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