engrossment vs focusing

engrossment and focusing both are nouns.

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

As nouns, focusing is a hyponym of engrossment; that is, focusing is a word with a more specific, narrower meaning than engrossment:

Other hyponyms of engrossment include centering, centring, direction, focal point, focus, focussing, specialism, study.

engrossment (noun)	focusing (noun)
the quality of being intent and concentrated	the act of bringing into focus
the mental state of being preoccupied by something	the concentration of attention or energy on something
complete attention; intense mental effort