elbow bone vs olecranon process

elbow bone and olecranon process both are nouns.

Word	Noun	Adjective	Verb	Adverb
elbow bone	Yes	No	No	No
olecranon process	Yes	No	No	No

elbow bone (noun)	olecranon process (noun)
the inner and longer of the two bones of the human forearm	process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended