refutal vs disproof

refutal and disproof both are nouns.

Word	Noun	Adjective	Verb	Adverb
refutal	Yes	No	No	No
disproof	Yes	No	No	No

As nouns, refutal and disproof are synonyms defined as:

Other synonyms of refutal include falsification, falsifying, refutation.

refutal (noun)	disproof (noun)
the act of determining that something is false	the act of determining that something is false
	any evidence that helps to establish the falsity of something