fiction vs fantasy

fiction and fantasy both are nouns.

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

As nouns, fantasy is a hyponym of fiction; that is, fantasy is a word with a more specific, narrower meaning than fiction:

fiction: a literary work based on the imagination and not necessarily on fact
fantasy: fiction with a large amount of imagination in it

Other hyponyms of fiction include dystopia, novel, phantasy, story, utopia.

fiction (noun)	fantasy (noun)
a literary work based on the imagination and not necessarily on fact	imagination unrestricted by reality
a deliberately false or improbable account	something many people believe that is false
	fiction with a large amount of imagination in it

fiction (verb)	fantasy (verb)
	indulge in fantasies