nothingness vs void

nothingness and void both are nouns.

Word	Noun	Adjective	Verb	Adverb
nothingness	Yes	No	No	No
void	Yes	Yes	Yes	No

As nouns, nothingness and void are synonyms defined as:

Other synonyms of nothingness include nihility, nullity.

nothingness (noun)	void (noun)
empty rhetoric or insincere or exaggerated talk	an empty area or space
the state of nonexistence	the state of nonexistence

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

nothingness (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