A spelling aid is a tool used to help people learn how to spell words correctly. The three crossword solutions for the term 'spelling aid' are WAND (4 letters), MOJO (4 letters), and VOODOODOLL (10 letters). A WAND is a magical device used in many fantasy stories, while MOJO is a term used to describe a person's charm or power. A voodoodoll is an object used in voodoo rituals, which are spiritual practices originating from West Africa.