"theorize" in the verb sense
1. speculate, theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, suppose
to believe especially on uncertain or tentative grounds
"Scientists supposed that large dinosaurs lived in swamps"
construct a theory about
"Galileo theorized the motion of the stars"
form or construct theories
"he thinks and theorizes all day"
Source: WordNet® (An amazing lexical database of English)
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