Verb (used with object), : I disproved his claim.    From Dictionary.com. 

It would be so simple, and disprover any doubters.    From Wordnik.com.  [New Scientist - Online News] Reference

Particular results may be presented in a way which clearly “disproves” an hypothesis as stated either by the proposer or the disprover, but generally it’s not cut and dry that the evidence present is sufficiently vetted that it can serve as a disproof.    From Wordnik.com.  [National Post Today « Climate Audit] Reference