prima donna vs diva

prima donna and diva both are nouns.

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

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

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

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