zirconia vs zirconium oxide

zirconia and zirconium oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
zirconia	Yes	No	No	No
zirconium oxide	Yes	No	No	No

As nouns, zirconia and zirconium oxide are synonyms defined as:

zirconia and zirconium oxide: a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes

Other synonyms of zirconia include zirconium dioxide.

zirconia (noun)	zirconium oxide (noun)
a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes	a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes