pectus vs body part

pectus and body part both are nouns.

Word	Noun	Adjective	Verb	Adverb
pectus	Yes	No	No	No
body part	Yes	No	No	No

As nouns, body part is a hypernym of pectus; that is, body part is a word with a broader meaning than pectus:

pectus: the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates
body part: any part of an organism such as an organ or extremity

pectus (noun)	body part (noun)
the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates	any part of an organism such as an organ or extremity