preoccupancy vs preoccupied

preoccupancy is a noun but preoccupied is not a noun.

Word	Noun	Adjective	Verb	Adverb
preoccupancy	Yes	No	No	No
preoccupied	No	Yes	No	No

preoccupancy (noun)	preoccupied (noun)
the act of taking occupancy before someone else does
the mental state of being preoccupied by something

preoccupancy (adjective)	preoccupied (adjective)
	having or showing excessive or compulsive concern with something
	deeply absorbed in thought