fluxing lime vs burnt lime

fluxing lime and burnt lime both are nouns.

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

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

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

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

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