elbow joint vs human elbow

elbow joint and human elbow both are nouns.

Word	Noun	Adjective	Verb	Adverb
elbow joint	Yes	No	No	No
human elbow	Yes	No	No	No

As nouns, elbow joint and human elbow are synonyms defined as:

elbow joint and human elbow: hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped

Other synonyms of elbow joint include articulatio cubiti, cubital joint, cubitus, elbow.

elbow joint (noun)	human elbow (noun)
hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped	hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped