hinge joint vs diarthrosis

hinge joint and diarthrosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
hinge joint	Yes	No	No	No
diarthrosis	Yes	No	No	No

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

hinge joint: a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane
diarthrosis: a joint so articulated as to move freely

Other hypernyms of hinge joint include articulatio synovialis, synovial joint.

hinge joint (noun)	diarthrosis (noun)
a joint allowing movement in one plane only	a joint so articulated as to move freely
a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane