occupancy vs occupy

occupancy is a noun but occupy is not a noun.

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

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

occupancy (verb)	occupy (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