fete vs carnival

fete and carnival both are nouns.

Word	Noun	Adjective	Verb	Adverb
fete	Yes	No	Yes	No
carnival	Yes	No	No	No

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

fete (noun)	carnival (noun)
an organized series of acts and performances (usually in one place)	a festival marked by merrymaking and processions
an elaborate party (often outdoors)	a traveling show; having sideshows and rides and games of skill etc.
	a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment

fete (verb)	carnival (verb)
have a celebration