No seriously, I always get blank stares when I ask people, I've called them wall chargers or power bricks, my friend called them plug chargers, my fiancee calls them dongles. What do you call these around your house, like when you're asking someone if they've seen any (______)'s
If the transformer is in the same housing at the plug with a separate cable (as shown): wall wart.
If the DC cable is attached, it's a charger.
If it's housed in its own case, it's a power brick.
If there's no transformer it's a power lead, unless it's rated for over 10A, then it's a power cable.
Dongles are peripherals that are housed in the same casing as the host connector. Anyone who thinks they can power a device with a dongle is a dangerous sociopath.