The crossword solution for the term ONE MAY BE EVIL is TWIN, which is a four letter word. The term 'TWIN' is used to describe two individuals who are born at the same time and share many physical characteristics. Twins can be either identical or fraternal, and they often have a special bond with each other. In some cases, one TWIN may be seen as good while the other is seen as evil, which is what the term ONE MAY BE EVIL is referring to.