A person who makes or relies on conjectures; someone inclined to guessing or speculation.
From conjectural plus -ist suffix (meaning 'one who practices or believes in'). The -ist suffix comes from Latin and Greek and creates agent nouns for people with particular practices.
A conjecturalist is basically a professional guesser—but sometimes the most creative breakthroughs in science come from bold conjecturalists willing to imagine beyond current evidence!
Complete word intelligence in one call. Free tier — 50 lookups/day.