fetoscopy vs prenatal diagnosis

fetoscopy and prenatal diagnosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetoscopy	Yes	No	No	No
prenatal diagnosis	Yes	No	No	No

As nouns, prenatal diagnosis is a hypernym of fetoscopy; that is, prenatal diagnosis is a word with a broader meaning than fetoscopy:

fetoscopy: prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood
prenatal diagnosis: any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality

fetoscopy (noun)	prenatal diagnosis (noun)
prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood	any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality