pectus vs thorax

pectus and thorax both are nouns.

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

As nouns, pectus and thorax are synonyms defined as:

pectus and thorax: the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates

Other synonyms of pectus include chest.

pectus (noun)	thorax (noun)
the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates	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