The term 'keeps out' can be expressed in four different ways: bars (4 letters), debars (6 letters), OMITS (5 letters), and excludes (8 letters). Bars is a physical barrier that prevents access to something, while debars is the act of preventing someone from entering or participating. Omitting is the act of leaving something out, and excluding is the act of deliberately not including something. All four terms refer to the idea of keeping something out or away from something else.