human knee vs ginglymoid joint

human knee and ginglymoid joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
human knee	Yes	No	No	No
ginglymoid joint	Yes	No	No	No

As nouns, ginglymoid joint is a hypernym of human knee; that is, ginglymoid joint is a word with a broader meaning than human knee:

human knee: hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
ginglymoid joint: a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane

Other hypernyms of human knee include ginglymus, hinge joint.

human knee (noun)	ginglymoid joint (noun)
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella	a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane