ammonia alum vs aluminum

ammonia alum and aluminum both are nouns.

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

As nouns, aluminum is a hypernym of ammonia alum; that is, aluminum 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
aluminum: a silvery ductile metallic element found primarily in bauxite

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

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