Noun

• S: (n) speculation, conjecture (a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)) "speculations about the outcome of the election"; "he dismissed it as mere conjecture"
• S: (n) guess, conjecture, supposition, surmise, surmisal, speculation, hypothesis (a message expressing an opinion based on incomplete evidence)
• S: (n) conjecture (reasoning that involves the formation of conclusions from incomplete evidence)

Verb

• S: (v) speculate, theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, suppose (to believe especially on uncertain or tentative grounds) "Scientists supposed that large dinosaurs lived in swamps"