ripper vs murderer

ripper and murderer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ripper	Yes	No	No	No
murderer	Yes	No	No	No

As nouns, murderer is a hypernym of ripper; that is, murderer is a word with a broader meaning than ripper:

ripper: a murderer who slashes the victims with a knife
murderer: a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)

Other hypernyms of ripper include liquidator, manslayer.

ripper (noun)	murderer (noun)
a murderer who slashes the victims with a knife	a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)