predator vs aggressor

predator and aggressor both are nouns.

Word	Noun	Adjective	Verb	Adverb
predator	Yes	No	No	No
aggressor	Yes	No	No	No

As nouns, aggressor is a hypernym of predator; that is, aggressor is a word with a broader meaning than predator:

Other hypernyms of predator include assailant, assaulter, attacker.

predator (noun)	aggressor (noun)
any animal that lives by preying on other animals	someone who attacks
someone who attacks in search of booty	a confident assertive person who acts as instigator