male chest vs thorax

male chest and thorax both are nouns.

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

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

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

Other hypernyms of male chest include chest, pectus.

male chest (noun)	thorax (noun)
the chest of a man	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