cubitus vs articulatio cubiti

cubitus and articulatio cubiti both are nouns.

Word	Noun	Adjective	Verb	Adverb
cubitus	Yes	No	No	No
articulatio cubiti	Yes	No	No	No

As nouns, cubitus and articulatio cubiti are synonyms defined as:

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

Other synonyms of cubitus include cubital joint, elbow, elbow joint, human elbow.

cubitus (noun)	articulatio cubiti (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