fluxing lime vs calcium oxide

fluxing lime and calcium oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
fluxing lime	Yes	No	No	No
calcium oxide	Yes	No	No	No

As nouns, fluxing lime and calcium oxide are synonyms defined as:

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

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

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