defender vs guardian

defender and guardian both are nouns.

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

As nouns, defender and guardian are synonyms defined as:

Other synonyms of defender include protector, shielder.

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