Nouns

(n)disproof, falsification, refutationany evidence that helps to establish the falsity of something
(n)falsification, misrepresentationa willful perversion of facts
(n)falsification, falsehoodthe act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting
(n)falsification, falsifying, disproof, refutation, refutalthe act of determining that something is false