waster vs undoer

waster and undoer both are nouns.

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

As nouns, waster and undoer are synonyms defined as:

Other synonyms of waster include destroyer, ruiner, uprooter.

waster (noun)	undoer (noun)
someone who dissipates resources self-indulgently	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