pair of trousers vs leg

pair of trousers and leg both are nouns.

Word	Noun	Adjective	Verb	Adverb
pair of trousers	Yes	No	No	No
leg	Yes	No	No	No

pair of trousers (noun)	leg (noun)
(usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately	a section or portion of a journey or course
	(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