atomic vs atom

atomic is not a noun while atom is a noun.

Word	Noun	Adjective	Verb	Adverb
atomic	No	Yes	No	No
atom	Yes	No	No	No

atomic (noun)	atom (noun)
	(physics and chemistry) the smallest component of an element having the chemical properties of the element
	(nontechnical usage) a tiny piece of anything

atomic (adjective)	atom (adjective)
(weapons) deriving destructive energy from the release of atomic energy
of or relating to or comprising atoms
immeasurably small