Vocalizations
Yes, bunnies do make noise!
Growling
When a bunny feels threatened or annoyed, you may here a growl. Growls tend to be fairly soft (even though your bunny is probably convinced that he or she is as loud and threatening as a lion). They often sound like 'HUFFF!' and may be accompanied by boxing or a lunge.
Honking
Honking is often a sign of pleasure. Some bunnies honk when they are eating, getting treats, getting attention, or snuggling.
In this video, if you turn your volume waaaay up, you can hear a bunny happily honking as he enjoys some fresh veggies.
Screaming
You never want to hear a bunny scream. A scream indicates severe pain or fear, and is a sign that your bunny needs help, and needs it fast.