fiction vs dystopia

fiction and dystopia both are nouns.

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

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

fiction: a literary work based on the imagination and not necessarily on fact
dystopia: a work of fiction describing an imaginary place where life is extremely bad because of deprivation or oppression or terror

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

fiction (noun)	dystopia (noun)
a literary work based on the imagination and not necessarily on fact	a work of fiction describing an imaginary place where life is extremely bad because of deprivation or oppression or terror
a deliberately false or improbable account	state in which the conditions of life are extremely bad as from deprivation or oppression or terror