Don’t mean to single you out, Markxxx, but your question illustrates a common misconception/problem.
You can’t base pet bunny care on assumptions about what wild rabbits do, for two reasons.
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Pet bunnies have been bred to be domestic animals. They are not much more capable of being wild bunnies than your dog is capable of being a wild wolf. Granted, there are probably more differences between wolves and pet dogs than between pet bunnies and wild rabbits, but the differences are many and important. Thousands of pet rabbits die every year after being released in the wild by people who expect they’ll care for themselves and run free. They don’t; they just die. A handful get rescued by someone else and adopted or taken to a shelter before they die.
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Wild bunnies die a lot. They have short lifespans. Rabbits “breed like rabbits” because they need to in order to replace all the ones that die. Most of them are killed by some other animal that eats them, of course, but many others die all on their own. Wild rabbits do have problems with their teeth, for instance, and sometimes die of it. If you want to keep your pet bunny alive for as long as possible, you’ll want to avoid the dangers wild bunnies are subject to, and make sure it gets good vet care.
On preview, yes, bunnies make some sounds, though not as many as dogs or cats.
[ul]
[li]Some bunnies growl, as mentioned upthread – mine used to growl at the cats, while rushing to headbutt them if they didn’t get out of her way; she believed it was her right to check the cats’ food bowls FIRST (before the cats) after I put food in them, to make sure I wasn’t sneaking in some cilantro with the cat kibble just this once.[/li][li]They grunt or chirp as they’re hopping along or as they’re bugging their human for attention.[/li][li]They grind their teeth in two ways: the first way is when they’re relaxed and content, and it sounds a little like a purr. The second is when they’re in pain, and it sounds harsher, like a person grinding their teeth in their sleep. (You can also tell the difference by their posture, if you’re not sure.)[/li][li]They thump their feet to make noise on purpose, usually to say “Something ain’t right! All other bunnies, take cover!” or sometimes “You humans so totally suck!”[/li][li]Finally, a rabbit in real distress or fear may scream – you do NOT want to hear that sound![/li][/ul]
My bunny makes a sort of barking grunting sound when attacking or warding off. He thumps with his back leg to express displeasure and fear (when there is thunder the poor little might works himself into a thumping lather trying to outthump the big sky bunny).
His main means of communication is by what I call “ear semaphore” see the Language of Lagomorths link. The position of his ear can let me know somewhat his emotional state.
I’ve only ever heard a very occasional grunt from one of my rabbits, usually an annoyance thing. They also flick their feet at us occasionally, as they hop away - that’s typically in irritation that we had picked them up, and when we put them down the flicking starts.
Once I had one of the rabbits outside of the playpen, running around the house, and the other was still inside. The second rabbit watched this for a bit with wide eyes, then let out a quick and loud stomp! stomp! He was not happy that the other one was running around free while he was stuck.
Ritter, mudgirl has a great assortment of pets! She is a great ‘pet mama’, even though I have to remind her occasionally to check and make sure that her snakes have water, etc. After all, she’s young! But she’ll get Peanut Butter out of the cage and say to him “Do you want grandma to hold you and give you skritches? Do you? Do you?” 
Then she’ll hand him off to me. She gives him plenty of celery, carrots, Timothy grass. He doesn’t seem wild about pellets. Next time we have bananas, I will have to suggest that she give him a slice!
Lots of good advice in this thread!
I know many rodents are very social, and do much better if they have a “friend”; should we get a second bunny?
<picky>They’re lagomorphs, not rodents.</picky> 
Rabbits may have to be socialized with each other very carefully. My rabbit-owning coworker worked at a shelter that had rabbits, and saw one attack another rabbit, with blood being drawn, because they were not introduced gradually. And of course, they had better be the same gender or at least one has to be fixed, else you may have a problem pretty quickly. Telling the gender apart can be tough when they’re young; the vets had to do a serious exam on the smaller of our rabbits to confirm that yes, he’s definitely a male. Turns out he had very small testicles and they took a long time to descend properly.
Most sources I’ve read recommend separating the two rabbits by a cage wall so that they can see and sniff each other, but not fight. A gradual introduction may do the trick. My rabbits were introduced to each other before I ever got them, and they’re good buddies. The larger male was humping the smaller one from age 10 weeks, but after getting fixed, he’s only done it maybe once a month; I gather it’s a dominance thing.
Rabbits can scream. It’s a sound you never want to hear.