focal point vs engrossment

focal point and engrossment both are nouns.

Word	Noun	Adjective	Verb	Adverb
focal point	Yes	No	No	No
engrossment	Yes	No	No	No

As nouns, engrossment is a hypernym of focal point; that is, engrossment is a word with a broader meaning than focal point:

Other hypernyms of focal point include absorption, concentration, immersion.

focal point (noun)	engrossment (noun)
the concentration of attention or energy on something	the quality of being intent and concentrated
a point of convergence of light (or other radiation) or a point from which it diverges	the mental state of being preoccupied by something
a central point or locus of an infection in an organism	complete attention; intense mental effort