intentness vs engrossment

intentness and engrossment both are nouns.

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

As nouns, intentness and engrossment are synonyms defined as:

intentness and engrossment: the quality of being intent and concentrated

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