calcium oxide vs calx

calcium oxide and calx both are nouns.

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

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

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

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

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