prosthesis vs obturator

prosthesis and obturator both are nouns.

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

As nouns, obturator is a hyponym of prosthesis; that is, obturator is a word with a more specific, narrower meaning than prosthesis:

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

Other hyponyms of prosthesis include glass eye, implant, leg, peg, pegleg, wooden leg, vascular conduit, vascular prosthesis.

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