aluminum oxide vs aluminium oxide

aluminum oxide and aluminium oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
aluminum oxide	Yes	No	No	No
aluminium oxide	Yes	No	No	No

As nouns, aluminum oxide and aluminium oxide are synonyms defined as:

aluminum oxide and aluminium oxide: any of various forms of aluminum oxide occurring naturally as corundum

Other synonyms of aluminum oxide include alumina.

aluminum oxide (noun)	aluminium oxide (noun)
any of various forms of aluminum oxide occurring naturally as corundum	any of various forms of aluminum oxide occurring naturally as corundum