empty vs vacant

empty is a noun but vacant is not a noun.

Word	Noun	Adjective	Verb	Adverb
empty	Yes	Yes	Yes	No
vacant	No	Yes	No	No

empty (noun)	vacant (noun)
a container that has been emptied

empty (adjective)	vacant (adjective)
holding or containing nothing	without an occupant or incumbent
emptied of emotion	devoid of intelligence or thought
needing nourishment
devoid of significance or force

empty (verb)	vacant (verb)
excrete or discharge from the body
become empty or void of its content
make void or empty of contents
remove the contents of a container
leave behind empty; move out of