Lanthanum and Metallic element

Lanthanum noun - A white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.

Metallic element and lanthanum are semantically related. In some cases you can use "Metallic element" instead a noun "Lanthanum".

Metallic element noun - Any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc..

Lanthanum and metallic element are semantically related. Sometimes you can replace term "Lanthanum" with "Metallic element", this terms are similar.