specialism vs engrossment

specialism and engrossment both are nouns.

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

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

specialism: the concentration of your efforts on a particular field of study or occupation
engrossment: complete attention; intense mental effort

Other hypernyms of specialism include absorption, concentration, immersion.

specialism (noun)	engrossment (noun)
the special line of work you have adopted as your career	the quality of being intent and concentrated
the concentration of your efforts on a particular field of study or occupation	the mental state of being preoccupied by something
	complete attention; intense mental effort