peace officer vs defender

peace officer and defender both are nouns.

Word	Noun	Adjective	Verb	Adverb
peace officer	Yes	No	No	No
defender	Yes	No	No	No

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

Other hypernyms of peace officer include guardian, protector, shielder.

peace officer (noun)	defender (noun)
an officer of the law	a person who cares for persons or property
	a fighter who holds out against attack