paean vs kudos

paean and kudos both are nouns.

Word	Noun	Adjective	Verb	Adverb
paean	Yes	No	No	No
kudos	Yes	No	No	No

As nouns, kudos is a hypernym of paean; that is, kudos is a word with a broader meaning than paean:

Other hypernyms of paean include congratulations, extolment, praise.

paean (noun)	kudos (noun)
a formal expression of praise	an expression of approval and commendation
(ancient Greece) a hymn of praise (especially one sung in ancient Greece to invoke or thank a deity)