aluminium oxide vs aluminum oxide

aluminium oxide and aluminum oxide both are nouns.

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

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

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

Other synonyms of aluminium oxide include alumina.

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