atomic number 4 vs beryllium

atomic number 4 and beryllium both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 4	Yes	No	No	No
beryllium	Yes	No	No	No

As nouns, atomic number 4 and beryllium are synonyms defined as:

atomic number 4 and beryllium: a light strong brittle grey toxic bivalent metallic element

Other synonyms of atomic number 4 include Be, glucinium.

atomic number 4 (noun)	beryllium (noun)
a light strong brittle grey toxic bivalent metallic element	a light strong brittle grey toxic bivalent metallic element