dizziness vs lightheadedness

dizziness and lightheadedness both are nouns.

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

As nouns, dizziness and lightheadedness are synonyms defined as:

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

Other synonyms of dizziness include giddiness, vertigo.

dizziness (noun)	lightheadedness (noun)
a reeling sensation; a feeling that you are about to fall	a frivolous lack of prudence
	a reeling sensation; a feeling that you are about to fall