serial vs episode

serial and episode both are nouns.

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

serial (noun)	episode (noun)
a serialized set of programs	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 brief section of a literary or dramatic work that forms part of a connected series
	a happening that is distinctive in a series of related events

serial (adjective)	episode (adjective)
pertaining to or occurring in or producing a series
pertaining to or composed in serial technique
of or relating to the sequential performance of multiple operations
in regular succession without gaps