debunking vs repudiation

debunking and repudiation both are nouns.

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

As nouns, debunking and repudiation are synonyms defined as:

debunking (noun)	repudiation (noun)
the exposure of falseness or pretensions	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)