friskiness vs playfulness

friskiness and playfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
friskiness	Yes	No	No	No
playfulness	Yes	No	No	No

As nouns, playfulness is a hypernym of friskiness; that is, playfulness is a word with a broader meaning than friskiness:

Other hypernyms of friskiness include fun.

friskiness (noun)	playfulness (noun)
lively high-spirited playfulness	activities that are enjoyable or amusing
	a disposition to find (or make) causes for amusement
	a festive merry feeling