elbow vs nudge

elbow and nudge both are nouns.

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

As verbs, nudge is a hypernym of elbow; that is, nudge is a word with a broader meaning than elbow:

Other hypernyms of elbow include poke at, prod.

elbow (noun)	nudge (noun)
the joint of a mammal or bird that corresponds to the human elbow	a slight push or shake
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

elbow (verb)	nudge (verb)
shove one's elbow into another person's ribs	push into action by pestering or annoying gently
push one's way with the elbows	to push against gently