Open English Wordnet
Verbs
(v)speculate, theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, supposeto believe especially on uncertain or tentative grounds“Scientists supposed that large dinosaurs lived in swamps”
(v)presuppose, supposetake for granted or as a given; suppose beforehand“I presuppose that you have done your work”
(v)presuppose, supposerequire as a necessary antecedent or precondition“This step presupposes two prior ones”