This is the 7325th most frequent Spanish word.
guess
The Spanish word for "guess" is "adivinar," meaning to estimate or assume without certainty.
In this case, "adivina" (guess) is an imperative form used to prompt someone to make a conjecture.
Adivina qué hay en la caja.
Guess what is in the box.
Here, "suposición" (guess) is used as a noun to refer to an estimated idea or hypothesis.
Diría que eso cuesta unos veinte euros, pero es solo una suposición.
I would say that it costs around twenty euros, but it is just a guess.
The word "supongo" (I guess) is used here as a verb to express an assumption or supposition.