In French, forming the feminine of nouns referring to people or animals often involves more than just adding an -e. Frequently, this addition changes how the word is pronounced, transforming "silent" letters into audible ones or altering vowel sounds.
Many masculine nouns end in a consonant that is not pronounced. When the feminine -e is added, that consonant becomes audible.
For nouns ending in -er, an accent grave is added to the "e", changing the sound from a closed "e" to an open one, and the "r" is now pronounced:
Adding an -e can "denasalize" a vowel (like -in, -an, -en, -on). This means the vowel is pronounced clearly and the following consonant is sounded. In many cases, the consonant is also doubled in spelling.
Some feminine forms involve a significant change in the final syllable rather than just a simple addition:
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