undoer vs diversionist

undoer and diversionist both are nouns.

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

As nouns, diversionist is a hyponym of undoer; that is, diversionist is a word with a more specific, narrower meaning than undoer:

Other hyponyms of undoer include annihilator, iconoclast, image breaker, saboteur, wrecker, vandal.

undoer (noun)	diversionist (noun)
a person who destroys or ruins or lays waste to	someone who commits sabotage or deliberately causes wrecks
a person who unfastens or unwraps or opens
a seducer who ruins a woman