What is the Latin word for "knowledge"?

Answer 1

The word that you are probably looking for is "scientia," which is a feminine first declension noun that means "knowledge" or "skill."

The related verb form is "scire" (to know or understand), both of which form the basis for the English word "science."

You could also use something like "ars" which is a feminine third declension noun and roughly translates to "skill," or "knowledge."