preoccupied vs taken up

preoccupied and taken up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
preoccupied	No	Yes	No	No
taken up	No	Yes	No	No

As adjectives, preoccupied and taken up are synonyms defined as:

preoccupied and taken up: having or showing excessive or compulsive concern with something

Other synonyms of preoccupied include haunted, obsessed.

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