stoner vs assailant

stoner and assailant both are nouns.

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

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

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

Other hypernyms of stoner include aggressor, assaulter, attacker.

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