Gallium and Metallic element

Gallium noun - A rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores.

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

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..

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