ammonia alum vs ammonium alum

ammonia alum and ammonium alum both are nouns.

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

As nouns, ammonia alum and ammonium alum are synonyms defined as:

ammonia alum and ammonium alum: a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

Other synonyms of ammonia alum include alum.

ammonia alum (noun)	ammonium alum (noun)
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum	a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum