Latin word causor comes from Latin -one(-onem|m), Latin causa

Detailed word origin of causor

Dictionary entry	Language	Definition
-one(-onem|m)	Latin (lat)
causa	Latin (lat)	For the sake of or on account of (Medieval Latin) thing. (figuratively) justification, explanation. Case, claim, contention. Cause, reason. Motive, pretext. Situation, condition.
causor	Latin (lat)	I plead, dispute, debate. I pretend.

Words with the same origin as causor