elbow vs arm

elbow and arm both are nouns.

Word	Noun	Adjective	Verb	Adverb
elbow	Yes	No	Yes	No
arm	Yes	No	Yes	No

elbow (noun)	arm (noun)
the joint of a mammal or bird that corresponds to the human elbow	the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
the part of a sleeve that covers the elbow joint	any instrument or instrumentality used in fighting or hunting
a sharp bend in a road or river	the part of an armchair or sofa that supports the elbow and forearm of a seated person
a length of pipe with a sharp bend in it	any projection that is thought to resemble a human arm
hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped	a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb
	a division of some larger or more complex organization

elbow (verb)	arm (verb)
shove one's elbow into another person's ribs	prepare oneself for a military confrontation
push one's way with the elbows	supply with arms