spoil vs do by

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

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

As verbs, do by is a hypernym of spoil; that is, do by is a word with a broader meaning than spoil:

Other hypernyms of spoil include handle, treat.

spoil (noun)	do by (noun)
the act of stripping and taking by force
the act of spoiling something by causing damage to it
(usually plural) valuables taken by violence (especially in war)

spoil (verb)	do by (verb)
become unfit for consumption or use	interact in a certain way
alter from the original
make imperfect
destroy and strip of its possession
have a strong desire or urge to do something
hinder or prevent (the efforts, plans, or desires) of
treat with excessive indulgence
make a mess of, destroy or ruin