1) Anticipate 2) Conjecture 3) Construct a theory about 4) Expect 5) Form or construct theories 6) Hypothecate 7) Hypothesise 8) Hypothesize 9) Speculate 10) Suppose 11) Theorise 12) To speculate 1) Formulate 2) Guess 3) Hypothesise 4) Hypothesize 5) Ideate 6) Reconstruct 7) Speculate 8) Theorise 
• (v. i.) To form a theory or theories; to form opinions solely by theory; to speculate.
The'o·rize intransitive verb [ imperfect & past participle Theorized ; present participle & verbal noun Theorizing .] [ Confer French théoriser .] To form a theory or theories; to form opinions solely by theory; to speculate. 
[v] - construct a theory about 2. [v] - form or construct theories
theorize, theorized, theorizing, theorizes To form or propose a theory or theories about something; to speculate.
theorise verb to believe especially on uncertain or tentative grounds; `Scientists supposed that large dinosaurs lived in swamps`