Hypothesis
Part of speech: noun
Definition: A tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation. (general) An assumption taken to be true for the purpose of argument or investigation. The antecedent of a conditional statement.
Example sentence: God is not a hypothesis derived from logical assumptions, but an immediate insight, self-evident as light. He is not something to be sought in the darkness with the light of reason. He is the light.
Surmise
Part of speech: noun
Definition: Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess; as, surmises of jealousy or of envy.Reflection; thought; posit.
Part of speech: verb
Definition: To conjecture, to opine or to posit with contestable premises.