night rider vs assaulter

night rider and assaulter both are nouns.

Word	Noun	Adjective	Verb	Adverb
night rider	Yes	No	No	No
assaulter	Yes	No	No	No

As nouns, assaulter is a hypernym of night rider; that is, assaulter is a word with a broader meaning than night rider:

night rider: member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge
assaulter: someone who attacks

Other hypernyms of night rider include aggressor, assailant, attacker.

night rider (noun)	assaulter (noun)
member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge	someone who attacks