female chest vs thorax

female chest and thorax both are nouns.

Word	Noun	Adjective	Verb	Adverb
female chest	Yes	No	No	No
thorax	Yes	No	No	No

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

female chest: the chest of a woman
thorax: the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates

Other hypernyms of female chest include chest, pectus.

female chest (noun)	thorax (noun)
the chest of a woman	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