potash alum vs atomic number 13

potash alum and atomic number 13 both are nouns.

Word	Noun	Adjective	Verb	Adverb
potash alum	Yes	No	No	No
atomic number 13	Yes	No	No	No

As nouns, atomic number 13 is a hypernym of potash alum; that is, atomic number 13 is a word with a broader meaning than potash alum:

potash alum: a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
atomic number 13: a silvery ductile metallic element found primarily in bauxite

Other hypernyms of potash alum include Al, aluminium, aluminum, double salt.

potash alum (noun)	atomic number 13 (noun)
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum	a silvery ductile metallic element found primarily in bauxite