Mn and Metallic element

Mn noun - A hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals.

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

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..

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