obturator vs prosthesis

obturator and prosthesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
obturator	Yes	No	No	No
prosthesis	Yes	No	No	No

As nouns, prosthesis is a hypernym of obturator; that is, prosthesis is a word with a broader meaning than obturator:

obturator: a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate)
prosthesis: corrective consisting of a replacement for a part of the body

Other hypernyms of obturator include prosthetic device.

obturator (noun)	prosthesis (noun)
a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate)	corrective consisting of a replacement for a part of the body