pectoral vs thorax

pectoral and thorax both are nouns.

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

pectoral (noun)	thorax (noun)
an adornment worn on the chest or breast	part of an insect's body that bears the wings and legs
either of two large muscles of the chest	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

pectoral (adjective)	thorax (adjective)
of or relating to the chest or thorax