E vs e

E and e both are nouns.

Word	Noun	Adjective	Verb	Adverb
E	Yes	No	No	No
e	Yes	No	No	No

As nouns, E and e are synonyms defined as:

E (noun)	e (noun)
the 5th letter of the Roman alphabet	the 5th letter of the Roman alphabet
the cardinal compass point that is at 90 degrees	the base of the natural system of logarithms; approximately equal to 2.718282...
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