What are the opposite words for guess?

Guess is a word that is often used when a person is uncertain about something. It is a verb that means to make an estimate or to offer an opinion without knowing all the facts. However, when we need to convey the opposite of the word guess, we may use antonyms such as "know," which means to have knowledge about something or to be aware of what it is. Other antonyms for guess include "prove," "determine," "calculate," and "ascertain," all of which suggest a degree of certainty and accuracy that is lacking in the concept of simply guessing. Using these antonyms can help to convey a greater sense of certainty and confidence in the information being conveyed.