posture vs erect

posture is a noun but erect is not a noun.

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

posture (noun)	erect (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

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

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