Metallic element and Potassium

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..

Potassium and metallic element are semantically related. In some cases you can replace term "Potassium" with "Metallic element", this terms are similar.

Potassium noun - A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite.

Metallic element and potassium are semantically related. You can use "Metallic element" instead a noun "Potassium".