I waive my right to do something. I release you from your obligation to do something. Lawyers often use them interchangeably and redundantly (because lawyers are risk averse and use redundancy to cover their butts).
Practically speaking, if I waive my right to pursue you, then you have been released from your obligation to do it to me. If I release you from your obligation to do something to me, then I've waived my right to force you to do it.
Difference between a release and a waiver
I waive my right to do something.
I release you from your obligation to do something.
Lawyers often use them interchangeably and redundantly (because lawyers are risk averse and use redundancy to cover their butts).
Practically speaking, if I waive my right to pursue you, then you have been released from your obligation to do it to me.
If I release you from your obligation to do something to me, then I've waived my right to force you to do it.