calcium oxide vs fluxing lime

calcium oxide and fluxing lime both are nouns.

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

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

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

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

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