nonpareil vs humdinger

nonpareil and humdinger both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonpareil	Yes	Yes	No	No
humdinger	Yes	No	No	No

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

Other hyponyms of nonpareil include crackerjack, jimdandy, jimhickey, class act.

nonpareil (noun)	humdinger (noun)
colored beads of sugar used as a topping on e.g. candies and cookies	someone of remarkable excellence
a flat disk of chocolate covered with beads of colored sugar
model of excellence or perfection of a kind; one having no equal

nonpareil (adjective)	humdinger (adjective)
eminent beyond or above comparison