calcium oxide vs quicklime

calcium oxide and quicklime both are nouns.

Word	Noun	Adjective	Verb	Adverb
calcium oxide	Yes	No	No	No
quicklime	Yes	No	No	No

As nouns, calcium oxide and quicklime are synonyms defined as:

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

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

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