ammonia alum vs aluminium

ammonia alum and aluminium both are nouns.

Word	Noun	Adjective	Verb	Adverb
ammonia alum	Yes	No	No	No
aluminium	Yes	No	No	No

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

ammonia alum: a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
aluminium: a silvery ductile metallic element found primarily in bauxite

Other hypernyms of ammonia alum include Al, aluminum, atomic number 13, double salt.

ammonia alum (noun)	aluminium (noun)
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum	a silvery ductile metallic element found primarily in bauxite