Hide.
The homonym for hide is "hi'de" which means to keep out of sight or conceal something.
keep
It means keep watching the thing that is moving. For example, if they say keep your eye on the ball when you are working, it means concentrate on what you're doing. Keep your eye on the main idea and don't lose sight of your goal.
Keep and kelp are four letter words starting with K and ending with P.
kale, keep, kite, kiss
There is no letter that means you won the game. You keep playing until one person has all the candies (or pennies).
avert
guard
Kind, kill, keep, kink, kook
Hide
you follow him
A 5 letter word that means to keep worrying would be panic. The word panic is a worry related word.