torso vs posterior

torso and posterior both are nouns.

Word	Noun	Adjective	Verb	Adverb
torso	Yes	No	No	No
posterior	Yes	Yes	No	No

torso (noun)	posterior (noun)
the body excluding the head and neck and limbs	the fleshy part of the human body that you sit on
	a tooth situated at the back of the mouth

torso (adjective)	posterior (adjective)
	located at or near or behind a part or near the end of a structure
	coming at a subsequent time or stage