posture vs eversion

posture and eversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
posture	Yes	No	Yes	No
eversion	Yes	No	No	No

As nouns, eversion is a hyponym of posture; that is, eversion is a word with a more specific, narrower meaning than posture:

posture (noun)	eversion (noun)
the arrangement of the body and its limbs	the act of turning inside out
characteristic way of bearing one's body	the position of being turned outward
capability in terms of personnel and materiel that affect the capacity to fight a war
a rationalized mental attitude

posture (verb)	eversion (verb)
assume a posture as for artistic purposes
behave affectedly or unnaturally in order to impress others