Mécanicien, mécanicienne

 "Mécanicien" and "mécanicienne" are both French nouns that mean "mechanic." The difference between them lies in their gender.

    "Mécanicien" is the masculine form of the noun and refers to a male mechanic.
    "Mécanicienne" is the feminine form of the noun and refers to a female mechanic.

For example:

    "Mon frère est mécanicien." (My brother is a mechanic.)
    "Ma sœur est mécanicienne." (My sister is a mechanic.)