spoilsport vs persona non grata

spoilsport and persona non grata both are nouns.

Word	Noun	Adjective	Verb	Adverb
spoilsport	Yes	No	No	No
persona non grata	Yes	No	No	No

As nouns, persona non grata is a hypernym of spoilsport; that is, persona non grata is a word with a broader meaning than spoilsport:

Other hypernyms of spoilsport include unwelcome person.

spoilsport (noun)	persona non grata (noun)
someone who spoils the pleasure of others	a person who for some reason is not wanted or welcome
	a diplomat who is unacceptable to the government to which he is sent