dizziness vs vertigo

dizziness and vertigo both are nouns.

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

As nouns, dizziness and vertigo are synonyms defined as:

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

Other synonyms of dizziness include giddiness, lightheadedness.

dizziness (noun)	vertigo (noun)
a reeling sensation; a feeling that you are about to fall	a reeling sensation; a feeling that you are about to fall