fiction vs novel

fiction and novel both are nouns.

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

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

fiction: a literary work based on the imagination and not necessarily on fact
novel: an extended fictional work in prose; usually in the form of a story

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

fiction (noun)	novel (noun)
a literary work based on the imagination and not necessarily on fact	a printed and bound book that is an extended work of fiction
a deliberately false or improbable account	an extended fictional work in prose; usually in the form of a story

fiction (adjective)	novel (adjective)
	pleasantly new or different
	original and of a kind not seen before