defender vs shielder

defender and shielder both are nouns.

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

As nouns, defender and shielder are synonyms defined as:

Other synonyms of defender include guardian, protector.

defender (noun)	shielder (noun)
a person who cares for persons or property	a person who cares for persons or property
a fighter who holds out against attack