dizziness vs giddiness

dizziness and giddiness both are nouns.

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

As nouns, dizziness and giddiness are synonyms defined as:

dizziness and giddiness: a reeling sensation; a feeling that you are about to fall

Other synonyms of dizziness include lightheadedness, vertigo.

dizziness (noun)	giddiness (noun)
a reeling sensation; a feeling that you are about to fall	an impulsive scatterbrained manner
	a reeling sensation; a feeling that you are about to fall