black powder vs atomic number 16

black powder and atomic number 16 both are nouns.

Word	Noun	Adjective	Verb	Adverb
black powder	Yes	No	No	No
atomic number 16	Yes	No	No	No

black powder (noun)	atomic number 16 (noun)
a simple form of gunpowder, consisting of a mixture of saltpeter, charcoal, and sulfur; invented in the 9th century in China.	an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)