legend vs fable

legend and fable both are nouns.

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

As nouns, legend and fable are synonyms defined as:

legend and fable: a story about mythical or supernatural beings or events

legend (noun)	fable (noun)
brief description accompanying an illustration	a short moral story (often with animal characters)
a story about mythical or supernatural beings or events	a story about mythical or supernatural beings or events
	a deliberately false or improbable account