ideal vs humdinger

ideal and humdinger both are nouns.

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

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

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

ideal (noun)	humdinger (noun)
the idea of something that is perfect; something that one hopes to attain	someone of remarkable excellence
model of excellence or perfection of a kind; one having no equal

ideal (adjective)	humdinger (adjective)
of or relating to the philosophical doctrine of the reality of ideas
constituting or existing only in the form of an idea or mental image or conception
conforming to an ultimate standard of perfection or excellence; embodying an ideal