preoccupation vs engrossment

preoccupation and engrossment both are nouns.

Word	Noun	Adjective	Verb	Adverb
preoccupation	Yes	No	No	No
engrossment	Yes	No	No	No

As nouns, preoccupation and engrossment are synonyms defined as:

preoccupation and engrossment: the mental state of being preoccupied by something

Other synonyms of preoccupation include absorption, preoccupancy.

preoccupation (noun)	engrossment (noun)
the act of taking occupancy before someone else does	the quality of being intent and concentrated
the mental state of being preoccupied by something	the mental state of being preoccupied by something
an idea that preoccupies the mind and holds the attention	complete attention; intense mental effort