fetal movement vs foetal movement

fetal movement and foetal movement both are nouns.

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

As nouns, fetal movement and foetal movement are synonyms defined as:

fetal movement and foetal movement: motion of a fetus within the uterus (usually detected by the 16th week of pregnancy)

fetal movement (noun)	foetal movement (noun)
motion of a fetus within the uterus (usually detected by the 16th week of pregnancy)	motion of a fetus within the uterus (usually detected by the 16th week of pregnancy)