repudiation vs refusal

repudiation and refusal both are nouns.

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

As nouns, refusal is a hypernym of repudiation; that is, refusal is a word with a broader meaning than repudiation:

repudiation: refusal to acknowledge or pay a debt or honor a contract (especially by public authorities)
refusal: the act of refusing

repudiation (noun)	refusal (noun)
the exposure of falseness or pretensions	a message refusing to accept something that is offered
rejecting or disowning or disclaiming as invalid	the act of refusing
refusal to acknowledge or pay a debt or honor a contract (especially by public authorities)