void vs nothingness

void and nothingness both are nouns.

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

As nouns, void and nothingness are synonyms defined as:

Other synonyms of void include nihility, nullity.

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

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

void (verb)	nothingness (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