atomic number 58 vs monazite

atomic number 58 and monazite both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 58	Yes	No	No	No
monazite	Yes	No	No	No

atomic number 58 (noun)	monazite (noun)
a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group	a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium