Hg and Metallic element

Hg noun - A heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures.

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

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..

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