featherbrained vs airheaded

featherbrained and airheaded both are adjectives.

Word	Noun	Adjective	Verb	Adverb
featherbrained	No	Yes	No	No
airheaded	No	Yes	No	No

As adjectives, featherbrained and airheaded are synonyms defined as:

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

featherbrained (adjective)	airheaded (adjective)
lacking seriousness; given to frivolity	lacking seriousness; given to frivolity