potassium bicarbonate vs potassium acid carbonate

potassium bicarbonate and potassium acid carbonate both are nouns.

Word	Noun	Adjective	Verb	Adverb
potassium bicarbonate	Yes	No	No	No
potassium acid carbonate	Yes	No	No	No

As nouns, potassium bicarbonate and potassium acid carbonate are synonyms defined as:

potassium bicarbonate and potassium acid carbonate: a crystalline salt (KHCO3) that is used in baking powder and as an antacid

Other synonyms of potassium bicarbonate include potassium hydrogen carbonate.

potassium bicarbonate (noun)	potassium acid carbonate (noun)
a crystalline salt (KHCO3) that is used in baking powder and as an antacid	a crystalline salt (KHCO3) that is used in baking powder and as an antacid