helmet vs beaver

helmet and beaver both are nouns.

Word	Noun	Adjective	Verb	Adverb
helmet	Yes	No	No	No
beaver	Yes	No	Yes	No

helmet (noun)	beaver (noun)
a protective headgear made of hard material to resist blows	large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges
armor plate that protects the head	a hat made with the fur of a beaver (or similar material)
	a movable piece of armor on a medieval helmet used to protect the lower face
	a man's hat with a tall crown; usually covered with silk or with beaver fur
	a full beard
	the soft brown fur of the beaver

helmet (verb)	beaver (verb)
	work hard on something