diarthrosis vs articulatio

diarthrosis and articulatio both are nouns.

Word	Noun	Adjective	Verb	Adverb
diarthrosis	Yes	No	No	No
articulatio	Yes	No	No	No

As nouns, articulatio is a hypernym of diarthrosis; that is, articulatio is a word with a broader meaning than diarthrosis:

diarthrosis: a joint so articulated as to move freely
articulatio: (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)

Other hypernyms of diarthrosis include articulation, joint.

diarthrosis (noun)	articulatio (noun)
a joint so articulated as to move freely	(anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)