postpose vs lay

postpose is not a noun while lay is a noun.

Word	Noun	Adjective	Verb	Adverb
postpose	No	No	Yes	No
lay	Yes	Yes	Yes	No

As verbs, lay is a hypernym of postpose; that is, lay is a word with a broader meaning than postpose:

Other hypernyms of postpose include place, pose, position, put, set.

postpose (noun)	lay (noun)
	a narrative poem of popular origin
	a narrative song with a recurrent refrain

postpose (adjective)	lay (adjective)
	not of or from a profession
	characteristic of those who are not members of the clergy

postpose (verb)	lay (verb)
place after another constituent in the sentence	put in a horizontal position
	put into a certain place or abstract location
	lay eggs
	prepare or position for action or operation
	impose as a duty, burden, or punishment