Focal point and Navels

Focal point noun - A point of convergence of light (or other radiation) or a point from which it diverges.

Navels and focal point are semantically related In some cases you can replace term "Navels" with "Focal point", this terms are similar.

Focal point and navels are semantically related in center topic. Sometimes you can use "Focal point" instead a noun "Navels", if it concerns topics such as middle point.