fun vs puckishness

fun and puckishness both are nouns.

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

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

fun (noun)	puckishness (noun)
activities that are enjoyable or amusing	the trait of behaving like an imp
violent and excited activity
a disposition to find (or make) causes for amusement
verbal wit or mockery (often at another's expense but not to be taken seriously)