fiction vs utopia

fiction and utopia both are nouns.

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

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

fiction: a literary work based on the imagination and not necessarily on fact
utopia: a work of fiction describing a utopia

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

fiction (noun)	utopia (noun)
a literary work based on the imagination and not necessarily on fact	a work of fiction describing a utopia
a deliberately false or improbable account	ideally perfect state; especially in its social and political and moral aspects