refutation vs refutal

refutation and refutal both are nouns.

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

As nouns, refutation and refutal are synonyms defined as:

Other synonyms of refutation include disproof, falsification, falsifying.

refutation (noun)	refutal (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
the speech act of answering an attack on your assertions