leg vs knee joint

leg and knee joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
leg	Yes	No	No	No
knee joint	Yes	No	No	No

leg (noun)	knee joint (noun)
a section or portion of a journey or course	hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
(nautical) the distance traveled by a sailing vessel on a single tack
a cloth covering consisting of the part of a pair of trousers that covers a person's leg
one of the supports for a piece of furniture
a prosthesis that replaces a missing leg
a human limb; commonly used to refer to a whole limb but technically only the part of the limb between the knee and ankle
a structure in animals that is similar to a human leg and used for locomotion
the limb of an animal used for food
a part of a forked or branching shape