beast vs attacker

beast and attacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
beast	Yes	No	No	No
attacker	Yes	No	No	No

As nouns, attacker is a hypernym of beast; that is, attacker is a word with a broader meaning than beast:

Other hypernyms of beast include aggressor, assailant, assaulter.

beast (noun)	attacker (noun)
a living organism characterized by voluntary movement	someone who attacks
a cruelly rapacious person