fun vs perkiness

fun and perkiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
fun	Yes	No	No	No
perkiness	Yes	No	No	No

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

fun (noun)	perkiness (noun)
activities that are enjoyable or amusing	inappropriate playfulness
violent and excited activity	cheerfulness that bubbles to the surface
a disposition to find (or make) causes for amusement
verbal wit or mockery (often at another's expense but not to be taken seriously)