calcium oxide vs unslaked lime

calcium oxide and unslaked lime both are nouns.

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

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

calcium oxide and unslaked lime: 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, quicklime.

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