shielder vs hero

shielder and hero both are nouns.

Word	Noun	Adjective	Verb	Adverb
shielder	Yes	No	No	No
hero	Yes	No	No	No

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

shielder (noun)	hero (noun)
a person who cares for persons or property	the principal character in a play or movie or novel or poem
	a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
	a person distinguished by exceptional courage and nobility and strength
	someone who fights for a cause
	(classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god