fiction vs fable

fiction and fable both are nouns.

Word	Noun	Adjective	Verb	Adverb
fiction	Yes	No	No	No
fable	Yes	No	No	No

As nouns, fiction and fable are synonyms defined as:

Other synonyms of fiction include fabrication.

fiction (noun)	fable (noun)
a literary work based on the imagination and not necessarily on fact	a short moral story (often with animal characters)
a deliberately false or improbable account	a story about mythical or supernatural beings or events
	a deliberately false or improbable account