elbow vs crazy bone

elbow and crazy bone both are nouns.

Word	Noun	Adjective	Verb	Adverb
elbow	Yes	No	Yes	No
crazy bone	Yes	No	No	No

elbow (noun)	crazy bone (noun)
the joint of a mammal or bird that corresponds to the human elbow	a point on the elbow where the ulnar nerve passes near the surface; a sharp tingling sensation results when the nerve is knocked against the bone
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)	crazy bone (verb)
shove one's elbow into another person's ribs
push one's way with the elbows