calx vs calcium oxide

calx and calcium oxide both are nouns.

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

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

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

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

calx (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