thin air vs void

thin air and void both are nouns.

Word	Noun	Adjective	Verb	Adverb
thin air	Yes	No	No	No
void	Yes	Yes	Yes	No

As nouns, void is a hypernym of thin air; that is, void is a word with a broader meaning than thin air:

Other hypernyms of thin air include nihility, nothingness, nullity.

thin air (noun)	void (noun)
nowhere to be found in a giant void	an empty area or space
	the state of nonexistence

thin air (adjective)	void (adjective)
	containing nothing
	lacking any legal or binding force

thin air (verb)	void (verb)
	excrete or discharge from the body
	take away the legal force of or render ineffective
	clear (a room, house, place) of occupants or empty or clear (a place or receptacle) of something
	declare invalid