Yb vs atomic number 70

Yb and atomic number 70 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Yb	Yes	No	No	No
atomic number 70	Yes	No	No	No

As nouns, Yb and atomic number 70 are synonyms defined as:

Yb and atomic number 70: a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime

Other synonyms of Yb include ytterbium.

Yb (noun)	atomic number 70 (noun)
a unit of information equal to 1000 zettabits or 10^24 bits	a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime