fever|noun|a high body temperature which a person has when he is sick
exist|verb|to be; to live
system|noun|a method of organizing or doing something by following rules or a plan; a group of connected things or parts working together for a common purpose or goal
resource|noun|anything of value that people can use or sell; something that a country has, such as oil, minerals or land, that it can use to increase its wealth
success|noun|the reaching of a goal or thing desired; the achieving of a planned result
