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The word 'guess' is both a verb (guess, guesses, guessing, guessed) and a noun (guess, guesses).
Examples:
I can guess your age. (guess = verb)
Go ahead and make a guess. (guess = noun)
The possessive form for the singular noun guess is guess's.
i guess
Guess what Chicken butt
Guess when Chiken Pen
Guess who Chicken Poo
Guess where Chicken Eclairs
Guess Why Chicken Flys
Guess how Chicken Pow