conjecture, supposition

GUESS
WordClue
PLANscheme, theory
PUZZLEanybody's guess
SCHEMEtheory, system
HALSENYconjecture
SURMISEconjecture
CONJECTUREguess, supposition
HYPOTHESISsupposition
MATERIALISMtheory in philosophy
SURMISEconjecture, guess
MAGICconjuring, dwimmer