erect vs posture

erect is not a noun while posture is a noun.

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

erect (noun)	posture (noun)
	the arrangement of the body and its limbs
	characteristic way of bearing one's body
	capability in terms of personnel and materiel that affect the capacity to fight a war
	a rationalized mental attitude

erect (adjective)	posture (adjective)
upright in position or posture
of sexual organs; stiff and rigid

erect (verb)	posture (verb)
construct, build, or erect	assume a posture as for artistic purposes
cause to rise up	behave affectedly or unnaturally in order to impress others