atomic number 50 vs cassiterite

atomic number 50 and cassiterite both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 50	Yes	No	No	No
cassiterite	Yes	No	No	No

atomic number 50 (noun)	cassiterite (noun)
a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide	a hard heavy dark mineral that is the chief source of tin