What are the adjectives that to add to turn a masculin word to feminine word in french?

Answer 1

There are no such adjectives, nouns have a predetermined gender in French and cannot change gender that way.

For instance, a "chat" is a male cat or the generic name for the species, but the female cat is a different word, "chatte".

If you mean how, knowing a masculine name or adjective, you find the equivalent feminine name, the generic rule is to add a "e" suffix, but there are many exceptions especially for nouns, like the "cat" example above (+"te"), or for names ending with "er". For instance, "boulanger" (baker) gives "boulangère" (fem.) You need to know these words, you cannot always build them up from scratch with rules.

Answer 2

In French, you can often add an "e" to the masculine adjective to make it feminine. For example, "grand" (masculine) becomes "grande" (feminine). Other examples include "petit" to "petite" and "beau" to "belle."