atomic number 58 vs ytterbite

atomic number 58 and ytterbite both are nouns.

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

atomic number 58 (noun)	ytterbite (noun)
a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group	a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium