head-in-the-clouds vs flyaway

head-in-the-clouds and flyaway both are adjectives.

Word	Noun	Adjective	Verb	Adverb
head-in-the-clouds	No	Yes	No	No
flyaway	No	Yes	No	No

As adjectives, head-in-the-clouds and flyaway are synonyms defined as:

Other synonyms of head-in-the-clouds include flighty, scatterbrained.

head-in-the-clouds (adjective)	flyaway (adjective)
guided by whim and fancy	guided by whim and fancy
	(of hair or clothing) worn loose