knee vs cloth covering

knee and cloth covering both are nouns.

Word	Noun	Adjective	Verb	Adverb
knee	Yes	No	No	No
cloth covering	Yes	No	No	No

As nouns, cloth covering is a hypernym of knee; that is, cloth covering is a word with a broader meaning than knee:

knee: the part of a trouser leg that provides the cloth covering for the knee
cloth covering: a covering made of cloth

knee (noun)	cloth covering (noun)
joint between the femur and tibia in a quadruped; corresponds to the human knee	a covering made of cloth
the part of a trouser leg that provides the cloth covering for the knee
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella