What is the name of female organ of a flower(other than carpel)?

The female organ of a flower (other than the carpel) is Pistil.

[Extra information:

The gynoecium is a female reproductive structure that consists of carpels. It is consist of three structure such as style, ovary and stigma. Pollen sticks on stigma and reaches the ovary through the way of style. 

The ovary consists of ovules that produce the seed.]