engrossment vs preoccupation

engrossment and preoccupation both are nouns.

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

As nouns, engrossment and preoccupation are synonyms defined as:

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

Other synonyms of engrossment include absorption, preoccupancy.

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