Base metal and Rare earth

Base metal noun - A metal that is common and not considered precious.

Rare earth and base metal are semantically related in group of chemical elements topic. In some cases you can use "Rare earth" instead a noun phrase "Base metal".

Rare earth noun - Any element of the lanthanide series (atomic numbers 57 through 71).

Base metal and rare earth are semantically related in group of chemical elements topic. You can use "Base metal" instead a noun phrase "Rare earth".