length vs leg

length and leg both are nouns.

Word	Noun	Adjective	Verb	Adverb
length	Yes	No	No	No
leg	Yes	No	No	No

As nouns, leg is a hyponym of length; that is, leg is a word with a more specific, narrower meaning than length:

length (noun)	leg (noun)
a section of something that is long and narrow	a section or portion of a journey or course
the linear extent in space from one end to the other; the longest dimension of something that is fixed in place	(nautical) the distance traveled by a sailing vessel on a single tack
continuance in time	a cloth covering consisting of the part of a pair of trousers that covers a person's leg
the property of being the extent of something from beginning to end	one of the supports for a piece of furniture
size of the gap between two places	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