potash vs potassium hydroxide

potash and potassium hydroxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
potash	Yes	No	No	No
potassium hydroxide	Yes	No	No	No

As nouns, potash and potassium hydroxide are synonyms defined as:

potash and potassium hydroxide: a potassium compound often used in agriculture and industry

Other synonyms of potash include caustic potash.

potash (noun)	potassium hydroxide (noun)
a potassium compound often used in agriculture and industry	a potassium compound often used in agriculture and industry