prothorax vs thorax

prothorax and thorax both are nouns.

Word	Noun	Adjective	Verb	Adverb
prothorax	Yes	No	No	No
thorax	Yes	No	No	No

As nouns, thorax is a hypernym of prothorax; that is, thorax is a word with a broader meaning than prothorax:

prothorax: the anterior part of an insect's thorax; bears the first pair of legs
thorax: part of an insect's body that bears the wings and legs

prothorax (noun)	thorax (noun)
the anterior part of an insect's thorax; bears the first pair of legs	part of an insect's body that bears the wings and legs
	the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates
	the middle region of the body of an arthropod between the head and the abdomen