New word detection and domain dictionary recommendation are provided. When text content is received according to a given language, for example, Chinese language, words are extracted from the content by analyzing the content according to a variety of rules. The words then are ranked for inclusion into one or more lexicons or domain dictionaries for future use for such functionalities as text input methods, spellchecking, grammar checking, auto entry completion, definition, and the like. In addition, when a user is entering or editing text according to one or more prescribed domain dictionaries, a determination may be made as to whether more helpful domain dictionaries may be available. When entered words have a high degree of association with a given domain dictionary, that domain dictionary may be recommended to the user to increase the accuracy of the user's input of additional text and editing of existing text.