potassium hydroxide vs potash

potassium hydroxide and potash both are nouns.

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

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

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

Other synonyms of potassium hydroxide include caustic potash.

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