occupy vs occupier

occupy is not a noun while occupier is a noun.

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

occupy (noun)	occupier (noun)
	someone who lives at a particular place for a prolonged period or who was born there
	a member of a military force who is residing in a conquered foreign country

occupy (verb)	occupier (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