series vs episode

series and episode both are nouns.

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

series (noun)	episode (noun)
(mathematics) the sum of a finite or infinite sequence of expressions	film consisting of a succession of related shots that develop a given subject in a movie
a periodical that appears at scheduled times	a part of a broadcast serial
a serialized set of programs	a brief section of a literary or dramatic work that forms part of a connected series
(sports) several contests played successively by the same teams	a happening that is distinctive in a series of related events
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