repudiate vs repudiation

repudiate is not a noun while repudiation is a noun.

Word	Noun	Adjective	Verb	Adverb
repudiate	No	No	Yes	No
repudiation	Yes	No	No	No

repudiate (noun)	repudiation (noun)
	the exposure of falseness or pretensions
	rejecting or disowning or disclaiming as invalid
	refusal to acknowledge or pay a debt or honor a contract (especially by public authorities)

repudiate (verb)	repudiation (verb)
refuse to acknowledge, ratify, or recognize as valid
cast off
reject as untrue, unfounded, or unjust
refuse to recognize or pay