I deleted the App Store from my iPhone by accident how do I reinstall?

You can’t normally delete the App Store (there’s no little “x” top right when it wriggles), so could you have hidden it by mistake.

Try searching for it from your home screen.

Also a similar app is deletable, the Apple Store, could this be the one missing and if so it can be redownloaded from the App Store.

You can't delete the App Store. It is either on a different home screen, been put in a folder or you have Restrictions on and have hidden it. Check out Settings - General - Restrictions.