attacker vs stoner

attacker and stoner both are nouns.

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

As nouns, stoner is a hyponym of attacker; that is, stoner is a word with a more specific, narrower meaning than attacker:

attacker: someone who attacks
stoner: an attacker who pelts the victim with stones (especially with intent to kill)

attacker (noun)	stoner (noun)
someone who attacks	an attacker who pelts the victim with stones (especially with intent to kill)