athletics vs series

athletics and series both are nouns.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
series	Yes	No	No	No

athletics (noun)	series (noun)
an active diversion requiring physical exertion and competition	(mathematics) the sum of a finite or infinite sequence of expressions
participation in sports events as an extracurricular activity	a periodical that appears at scheduled times
a contest between athletes	a serialized set of programs
	(sports) several contests played successively by the same teams
	similar things placed in order or happening one after another
	a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection
	(electronics) connection of components in such a manner that current flows first through one and then through the other