Popgun
/ˈpɑːpɡʌn/
Definition 1 of 1
Pro Tip 1/3Toy Context
Popgun is used to describe a child's toy rather than a real weapon. 
For his birthday, he received a pirate costume and a popgun.
Pro Tip 2/3Onomatopoeia
The word imitates the sound ('pop') that the toy gun makes when fired. 
The popgun went 'pop' every time he pressed the trigger.
Pro Tip 3/3Not Dangerous
Unlike real guns, popguns are harmless and designed for play. 
Parents prefer popguns as they are safe toys that can't cause injuries.