funny bone vs crazy bone

funny bone and crazy bone both are nouns.

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

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

funny bone and crazy 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

funny bone (noun)	crazy 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