assailant vs lapidator

assailant and lapidator both are nouns.

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

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

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

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