crazy bone vs funny bone

crazy bone and funny bone both are nouns.

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

As nouns, crazy bone and funny bone are synonyms defined as:

crazy bone and funny bone: 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

crazy bone (noun)	funny bone (noun)
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	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