Difference between Preoccupied and Obsessed

PREOCCUPIED vs OBSESSED: ADJECTIVE

Concerned with something else; distracted; giving one's attention elsewhere.
Already used and therefore unavailable for further use. Used of taxonomic names.
Formerly or already occupied.
Excessively concerned with something; distracted.
Absorbed in thought; engrossed.
Deeply absorbed in thought
Having or showing excessive or compulsive concern with something

Intensely preoccupied with or by a given topic or emotion; driven by a specified obsession.
Having or showing excessive or compulsive concern with something
Influenced or controlled by a powerful force such as a strong emotion

In zoology and botany, already used as a name for a genus, species, etc., and therefore, by the laws of priority, rejected for any other genus, species, etc., to which it has been applied.
Occupied previously; engrossed; hence, lost in thought; meditative; abstracted.

Disturbed, Alarmed, Fascinated, Perturbed, Disquieted, Worried, Distracted, Deep in thought, Taken up, Thoughtful, Lost, Haunted, Bemused, Concerned, Obsessed

Enamored, Infatuated, Fixed, Pervert, Consumed, Oversexed, Addicted, Obsessive, Fixated, Taken up, Controlled, Possessed, Haunted, Concerned, Preoccupied

Concentrated, Disturbed, Alarmed, Fascinated, Perturbed, Disquieted, Worried, Distracted, Deep in thought, Thoughtful, Lost, Haunted, Bemused, Concerned, Obsessed

Besotted, Enamored, Infatuated, Fixed, Pervert, Consumed, Oversexed, Addicted, Obsessive, Fixated, Controlled, Possessed, Haunted, Concerned, Preoccupied

Patsy, that may have been preoccupied with work.
But I am much more preoccupied with loving.
Often we are too preoccupied to pay attention.
Not only that, I was preoccupied with self.
They said he looked well but very preoccupied.
''Suddenly they become preoccupied with neatness he said.
India preoccupied with problems in its immediate neighbourhood.
Germans appear to be preoccupied with such themes.
Whereas lovers are both preoccupied with each other, friends are both preoccupied with the same things.
Our era is entirely preoccupied with little things which are to no purpose, or rather it is entirely preoccupied in the service of money.