bilk vs rip off

bilk and rip off both are verbs.

Word	Noun	Adjective	Verb	Adverb
bilk	No	No	Yes	No
rip off	No	No	Yes	No

As verbs, rip off is a hypernym of bilk; that is, rip off is a word with a broader meaning than bilk:

Other hypernyms of bilk include cheat, chisel.

bilk (verb)	rip off (verb)
escape, either physically or mentally	remove by pulling or ripping violently and forcefully
evade payment to	take without the owner's consent
cheat somebody out of what is due, especially money	deprive somebody of something by deceit
hinder or prevent (the efforts, plans, or desires) of