A salute is a formal gesture of respect. Salutes are most often used by the military, but are also used by organisations like the Scouts.
You scare someone when you make them scared or frightened.
The man in the picture is trying to scare his cat.
You scatter something if you spread them around at roughly even spacing but with no real order. People often scatter seeds to feed birds. The acorns in the picture are scattered all over the ground.
A scoop is a kind of spoon that is deep and shaped like a hemisphere.
A scoop might also mean something made with a scoop, for example a scoop of icecream.
You scrub something when you use something stiff and scratchy like a scrubbing brush to clean it with. When you scrub something you do it vigorously, not gently.
