When a file or object is completely removed from the system, use Delete .
When a file or object can be recovered, use Move to Trash for files and Remove for list objects etc.
When a file or object can be removed and was originally installed, use Uninstall.
Use Settings for a configuration dialog which allows you to set specific properties or functionality. This usually applies to application configuration tools. For example, Konqueror Settings.
Use Options for a configuration dialog which provide. This usually applies to object configuration tools.
Use Properties for a list of metadata or details that are associated with a particular object which cannot be edited or interacted with in any way. For example, file "properties" dialog in Dolphin.