Ir and Iridium

Ir noun - A board of the British government that administers and collects major direct taxes.

Iridium and ir are semantically related. In some cases you can use "Iridium" instead a noun "Ir".

Iridium noun - A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.

Ir and iridium are semantically related. You can use "Ir" instead a noun "Iridium".