poke at vs elbow

poke at is not a noun while elbow is a noun.

Word	Noun	Adjective	Verb	Adverb
poke at	No	No	Yes	No
elbow	Yes	No	Yes	No

As verbs, elbow is a hyponym of poke at; that is, elbow is a word with a more specific, narrower meaning than poke at:

Other hyponyms of poke at include jog.

poke at (noun)	elbow (noun)
	the joint of a mammal or bird that corresponds to the human elbow
	the part of a sleeve that covers the elbow joint
	a sharp bend in a road or river
	a length of pipe with a sharp bend in it
	hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped

poke at (verb)	elbow (verb)
to push against gently	shove one's elbow into another person's ribs
	push one's way with the elbows