to guess; to conjecture; to surmise

to guess; to conjecture; to suppose; (math.) conjecture; hypothesis

to guess correctly; to figure out the right answer

to suspect; to have misgivings; suspicious; misgivings

to answer a riddle; to guess (i.e. form an opinion without much evidence)

to make a wild guess; blind guess

suspicion

unsuspecting; innocent and without apprehension

to hazard a guess

to try to predict the outcome of an event (for betting on sports results or for fun etc)