shield vs shielder

shield and shielder both are nouns.

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

shield (noun)	shielder (noun)
hard outer covering or case of certain organisms such as arthropods and turtles	a person who cares for persons or property
armor carried on the arm to intercept blows
a protective covering or structure

shield (verb)	shielder (verb)
protect, hide, or conceal from danger or harm
hold back a thought or feeling about