light-headed vs giddy

light-headed and giddy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
light-headed	No	Yes	No	No
giddy	No	Yes	No	No

As adjectives, light-headed and giddy are synonyms defined as:

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

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