Water gun and Watercannon

Water gun noun - Plaything consisting of a toy pistol that squirts water.

Watercannon and water gun are semantically related. In some cases you can replace term "Watercannon" with "Water gun", this terms are similar.

Watercannon noun - A hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters).

Water gun and watercannon are semantically related. Sometimes you can replace phrase "Water gun" with "Watercannon", this terms are similar.