eye movement vs motility

eye movement and motility both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye movement	Yes	No	No	No
motility	Yes	No	No	No

As nouns, motility is a hypernym of eye movement; that is, motility is a word with a broader meaning than eye movement:

Other hypernyms of eye movement include motion, move, movement.

eye movement (noun)	motility (noun)
the movement of the eyes	a change of position that does not entail a change of location
	ability to move spontaneously and independently