The term 'Earthling' is used to refer to a person who lives on Earth. It can be broken down into four words: EARTHLY (7 letters), MAN (3 letters), HUMAN (5 letters), and TERRAN (6 letters). EARTHLY refers to something that is of or relating to the planet Earth, while MAN is a term used to refer to a male HUMAN being. HUMAN is a term used to refer to any member of the species Homo sapiens, and TERRAN is a term used to refer to a HUMAN native to Earth. Together, these four words form the term 'Earthling, ' which is used to refer to a person who lives on Earth.