destroyer vs undoer

destroyer and undoer both are nouns.

Word	Noun	Adjective	Verb	Adverb
destroyer	Yes	No	No	No
undoer	Yes	No	No	No

As nouns, destroyer and undoer are synonyms defined as:

Other synonyms of destroyer include ruiner, uprooter, waster.

destroyer (noun)	undoer (noun)
a small fast lightly armored but heavily armed warship	a person who destroys or ruins or lays waste to
a person who destroys or ruins or lays waste to	a person who unfastens or unwraps or opens
	a seducer who ruins a woman