Cross section and Plane section

Cross section noun - A section created by a plane cutting a solid perpendicular to its longest axis.

Plane section and cross section are semantically related. In some cases you can use "Plane section" instead a noun phrase "Cross section".

Plane section noun - (geometry) the area created by a plane cutting through a solid.

Cross section and plane section are semantically related. Sometimes you can replace phrase "Cross section" with "Plane section", this phrases are similar.