Some of them certainly are. You can also get air rifles with built in “moderators” (i.e. suppressors) that are surprisingly quiet. Precharged pneumatic air rifles can be very powerful and also extremely accurate. I have a relatively cheap Hatsan that can, provided I’m using pellets that it likes, repeatably put pellets through the same hole in my target from as far away as I can get from it in my yard (probably about 20 yards) and do so about 30 times in succession before I have to pump it back up again. Its built in moderator makes it quiet enough at the muzzle that the sound of the hammer hitting the gas valve is actually louder than the report from firing.

Watch out: Researching this type of thing may send you tumbling down the rabbit hole of big bore air rifles and entice you to spend a lot of money. Don’t say I didn’t warn you…