engross vs engrossment

engross is not a noun while engrossment is a noun.

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

engross (noun)	engrossment (noun)
	the quality of being intent and concentrated
	the mental state of being preoccupied by something
	complete attention; intense mental effort

engross (verb)	engrossment (verb)
consume all of one's attention or time
devote (oneself) fully to