In 7 Days to Die, killall clears zombies with one command, and according to the game's own help text it does not touch players. If you want a challenge, spawnw h calls a wandering horde and spawnscouts calls screamer zombies. Air drops and supply crates also come by command. To pick zombies or animals one by one, turn on debug mode with dm and use the entity menu on F6.
Most codes here need cheats turned on first. See the section on how to open the console.
dm
killall
Zombies die instantly. According to the game's own help text, the command does not touch players.
killall alive
Animals die along with the zombies. According to the game's help text, vehicles and turrets are not affected.
spawnw h
Brings in one of the wandering hordes that roam the map right away. The long form is spawnwandering h; the old spawnwh no longer works.
spawnscouts
Spawns scout zombies (screamers) near you. Add a player name at the end and they appear near that player.
spawnairdrop
Starts an air drop, so you do not have to wait for the next one to get a supply package.
spawnsupplycrate
Brings a supply crate to where you stand.
shownexthordetime
Prints when the next wandering horde that roams the map will arrive. It does not show the blood moon horde.
While debug mode is on, the F6 key opens a list of zombies and animals you can spawn. Pick from the list and spawn them without typing a code.