burnt lime vs calx

burnt lime and calx both are nouns.

Word	Noun	Adjective	Verb	Adverb
burnt lime	Yes	No	No	No
calx	Yes	No	No	No

As nouns, burnt lime and calx are synonyms defined as:

burnt lime and calx: a white crystalline oxide used in the production of calcium hydroxide

Other synonyms of burnt lime include calcined lime, calcium oxide, fluxing lime, lime, quicklime, unslaked lime.

burnt lime (noun)	calx (noun)
a white crystalline oxide used in the production of calcium hydroxide	a white crystalline oxide used in the production of calcium hydroxide