VocabularySpellingCity.com explains the ins and outs of the prefix, an affix that comes before a root word. Learn more at www.spellingcity.com/prefixes-and-suffixes.html SpellingCity has both a free and premium service, the free service on VocabularySpellingCity allows teachers and parents to register and save lists. The premium version of VocabularySpellingCity gives access to the vocabulary and writing materials, the best spelling games, and give students their own login.