Repetition uses the same word, or synonyms, antonyms, etc. A version using synonyms from Roget's Thesaurus exists. To pun is to treat homonyms as synonyms. This helps resolve ambiguities such as those introduced by synonyms and homonyms. Most repeat the list of synonyms under each word. WordNet links words into semantic relations including synonyms, hyponyms, and meronyms. It is also possible to miss images that use different synonyms in their descriptions. Depending on region or country, multiple synonyms and alternative names exist. There are many obsolete synonyms for the species. The term "verge" has many synonyms and dialectal differences. Some standard headers do define more convenient synonyms for underscored identifiers. Some other "Chuci" poems refer to immortals with synonyms of "xian". Other approaches also collected training data based on unambiguous synonyms. The "mu" in the title refers to the synonyms of each name. Clues are generally short with a strong emphasis on synonyms and associations.