What is another word for "guesswork"?

Roget's Thesaurus (1911) lists these synonyms for "guesswork": analogy, approximation, association, assumed, assumption, bare, belief, blue, conceit, condition, conjecture, dark, data, divination, estimate, guess, hint, hypothesis, idea, imagination, impression, inkling, intimation, invention, loose, metaphor, metonymy, nearness, notion, original, plan, position, postulate, postulation, postulatum, presumption, presupposition, proposal, proposition, rough.