engrossment vs focus

engrossment and focus both are nouns.

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

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

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

engrossment (noun)	focus (noun)
the quality of being intent and concentrated	maximum clarity or distinctness of an image rendered by an optical system
the mental state of being preoccupied by something	maximum clarity or distinctness of an idea
complete attention; intense mental effort	the concentration of attention or energy on something
	a fixed reference point on the concave side of a conic section
	a point of convergence of light (or other radiation) or a point from which it diverges
	a central point or locus of an infection in an organism
	special emphasis attached to something

engrossment (verb)	focus (verb)
	become focussed or come into focus
	put (an image) into focus
	direct one's attention on something
	bring into focus or alignment; to converge or cause to converge; of ideas or emotions
	cause to converge on or toward a central point