frivolity vs giddiness

frivolity and giddiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
frivolity	Yes	No	No	No
giddiness	Yes	No	No	No

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

Other hyponyms of frivolity include silliness, levity, fun, playfulness.

frivolity (noun)	giddiness (noun)
acting like a clown or buffoon	an impulsive scatterbrained manner
something of little value or significance	a reeling sensation; a feeling that you are about to fall
the trait of being frivolous; not serious or sensible