diva vs prima donna

diva and prima donna both are nouns.

Word	Noun	Adjective	Verb	Adverb
diva	Yes	No	No	No
prima donna	Yes	No	No	No

As nouns, diva and prima donna are synonyms defined as:

diva and prima donna: a distinguished female operatic singer; a female operatic star

diva (noun)	prima donna (noun)
a distinguished female operatic singer; a female operatic star	a distinguished female operatic singer; a female operatic star
	a vain and temperamental person