occupy vs occupation

occupy is not a noun while occupation is a noun.

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

occupy (noun)	occupation (noun)
	the principal activity in your life that you do to earn money
	the act of occupying or taking possession of a building
	the control of a country by military forces of a foreign power
	any activity that occupies a person's attention
	the period of time during which a place or position or nation is occupied

occupy (verb)	occupation (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