occupy vs occupancy

occupy is not a noun while occupancy is a noun.

Word	Noun	Adjective	Verb	Adverb
occupy	No	No	Yes	No
occupancy	Yes	No	No	No

occupy (noun)	occupancy (noun)
	an act of being a tenant or occupant
	the act of occupying or taking possession of a building

occupy (verb)	occupancy (verb)
consume all of one's attention or time
march aggressively into another's territory by military force for the purposes of conquest and occupation
require (time or space)
keep busy with
assume, as of positions or roles
live (in a certain place)
occupy the whole of
be on the mind of