E vs atomic number 99

E and atomic number 99 both are nouns.

Word	Noun	Adjective	Verb	Adverb
E	Yes	No	No	No
atomic number 99	Yes	No	No	No

As nouns, E and atomic number 99 are synonyms defined as:

E and atomic number 99: a radioactive transuranic element produced by bombarding plutonium with neutrons

Other synonyms of E include einsteinium, Es.

E (noun)	atomic number 99 (noun)
the 5th letter of the Roman alphabet	a radioactive transuranic element produced by bombarding plutonium with neutrons
the cardinal compass point that is at 90 degrees
a radioactive transuranic element produced by bombarding plutonium with neutrons
a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body