Presuppose
Part of speech: verb
Definition: To assume some truth without proof, usually for the purpose of reaching a conclusion based on that truth.
Suppose
Part of speech: verb
Definition: To take for granted; to conclude, with less than absolute supporting data; to believe.To theorize or hypothesize.
Example sentence: It is a general popular error to suppose the loudest complainers for the public to be the most anxious for its welfare.