novel vs fiction

novel and fiction both are nouns.

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

As nouns, fiction is a hypernym of novel; that is, fiction is a word with a broader meaning than novel:

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

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

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