engrossment vs intentness

engrossment and intentness both are nouns.

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

As nouns, engrossment and intentness are synonyms defined as:

engrossment and intentness: the quality of being intent and concentrated

engrossment (noun)	intentness (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