stoner vs aggressor

stoner and aggressor both are nouns.

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

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

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

Other hypernyms of stoner include assailant, assaulter, attacker.

stoner (noun)	aggressor (noun)
an attacker who pelts the victim with stones (especially with intent to kill)	someone who attacks
	a confident assertive person who acts as instigator