fetal movement vs motility

fetal movement and motility both are nouns.

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

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

fetal movement: motion of a fetus within the uterus (usually detected by the 16th week of pregnancy)
motility: a change of position that does not entail a change of location

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

fetal movement (noun)	motility (noun)
motion of a fetus within the uterus (usually detected by the 16th week of pregnancy)	a change of position that does not entail a change of location
	ability to move spontaneously and independently