giddy vs lightheaded

giddy and lightheaded both are adjectives.

Word	Noun	Adjective	Verb	Adverb
giddy	No	Yes	No	No
lightheaded	No	Yes	No	No

As adjectives, giddy and lightheaded are synonyms defined as:

Other synonyms of giddy include airheaded, dizzy, empty-headed, featherbrained, light-headed, silly.

giddy (adjective)	lightheaded (adjective)
lacking seriousness; given to frivolity	lacking seriousness; given to frivolity
having or causing a whirling sensation; liable to falling	weak and likely to lose consciousness