aluminium oxide vs corundum

aluminium oxide and corundum both are nouns.

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

As nouns, corundum is a hypernym of aluminium oxide; that is, corundum is a word with a broader meaning than aluminium oxide:

aluminium oxide: any of various forms of aluminum oxide occurring naturally as corundum
corundum: very hard mineral used as an abrasive

Other hypernyms of aluminium oxide include corundom.

aluminium oxide (noun)	corundum (noun)
any of various forms of aluminum oxide occurring naturally as corundum	very hard mineral used as an abrasive