cubitus vs human elbow

cubitus and human elbow both are nouns.

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

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

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

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

cubitus (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
the arm from the elbow to the fingertips