The term 'rootless one' can be defined by two crossword solutions: DRIFTER (7 letters) and NOMAD (5 letters). A DRIFTER is someone who moves from place to place without any particular purpose or destination, while a NOMAD is someone who does not stay in one place for very long and often moves from place to place in search of food, water, and other resources. Both terms refer to people who have no permanent home and are constantly on the move.