guess

noun

an estimate based on little or no information
“My guess is that there are 1000 mints in the jar.”
dead reckoning
a message expressing an opinion based on incomplete evidence
“That's my guess.”
supposition

verb

to expect, believe, or suppose
“I guess I am one of the best basketball players here.”
think
to guess correctly
“I guessed it!”
infer
to judge tentatively or form an estimate of
“From the evidence we have, I guess this manuscript comes from the early 1800s.”
estimate
to put forward a guess in spite of possible refutation
“I am guessing that the price of real estate will rise again.”
venture