leg vs knock-knee

leg and knock-knee both are nouns.

Word	Noun	Adjective	Verb	Adverb
leg	Yes	No	No	No
knock-knee	Yes	No	No	No

leg (noun)	knock-knee (noun)
a section or portion of a journey or course	an inward slant of the thigh
(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