stabber vs attacker

stabber and attacker both are nouns.

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

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

Other hypernyms of stabber include aggressor, assailant, assaulter.

stabber (noun)	attacker (noun)
someone who stabs another person	someone who attacks