outdo vs shell

outdo is not a noun while shell is a noun.

Word	Noun	Adjective	Verb	Adverb
outdo	No	No	Yes	No
shell	Yes	No	Yes	No

As verbs, shell is a hypernym of outdo; that is, shell is a word with a broader meaning than outdo:

Other hypernyms of outdo include beat, beat out, crush, trounce, vanquish.

As verbs, shell is a hypernym of outdo; that is, shell is a word with a broader meaning than outdo:

Other hypernyms of outdo include beat, beat out, crush, trounce, vanquish.

outdo (noun)	shell (noun)
	the hard largely calcareous covering of a mollusc or a brachiopod
	hard outer covering or case of certain organisms such as arthropods and turtles
	ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile; fired from a large gun
	a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners)
	the housing or outer covering of something
	a very light narrow racing boat
	a rigid covering that envelops an object
	the exterior covering of a bird's egg
	the hard usually fibrous outer layer of some fruits especially nuts
	the material that forms the hard outer covering of many animals

outdo (verb)	shell (verb)
be or do something to a greater degree	remove from its shell or outer covering
get the better of	remove the husks from
	use explosives on
	come out better in a competition, race, or conflict
	hit the pitches of hard and regularly
	look for and collect shells by the seashore
	fall out of the pod or husk
	create by using explosives