keeper vs defender

keeper and defender both are nouns.

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

As nouns, defender is a hypernym of keeper; that is, defender is a word with a broader meaning than keeper:

Other hypernyms of keeper include guardian, protector, shielder.

As nouns, defender is a hypernym of keeper; that is, defender is a word with a broader meaning than keeper:

Other hypernyms of keeper include guardian, protector, shielder.

keeper (noun)	defender (noun)
one having charge of buildings or grounds or animals	a person who cares for persons or property
someone in charge of other people	a fighter who holds out against attack