nitre vs potassium nitrate

nitre and potassium nitrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitre	Yes	No	No	No
potassium nitrate	Yes	No	No	No

As nouns, nitre and potassium nitrate are synonyms defined as:

nitre and potassium nitrate: (KNO3) used especially as a fertilizer and explosive

Other synonyms of nitre include niter, saltpeter, saltpetre.

nitre (noun)	potassium nitrate (noun)
(KNO3) used especially as a fertilizer and explosive	(KNO3) used especially as a fertilizer and explosive