Potash and Potassium

Potash noun - A potassium compound often used in agriculture and industry.

Potassium and potash are semantically related. In some cases you can use "Potassium" instead a noun "Potash".

Potassium noun - A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite.

Potash and potassium are semantically related. You can use "Potash" instead a noun "Potassium".