Wrap: put a covering on; or wind or coil round. At the end of filming a director says 'that's a wrap'; and people talking about wrapping up a project; or wrapping up loose ends.
Rap: to knock sharply or perform a rhythmic speech with a musical backing. It's also a legal charge -- a murder rap (probably only for headlines in punchier papers). You can also take the rap for somebody else's crimes -- meaning you take their punishment for them.