Noble metal and Rare earth

Noble metal noun - Any metal that is resistant to corrosion or oxidation.

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

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

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