The words are etymological twin cognates and are considered interchangeable. The word has no known cognates beyond Germanic and Celtic. This list comprises cognates, which evolved from old Germanic modal auxiliaries. The word has cognates, or near cognates, in other Germanic languages. The word has many cognates outside of Germanic and Celtic, notably and . The set of all cognates of a word is the etymology of the word. Some terms are thought be cognates with words in Tai Kadai and Austronesian languages. Clippinger presents 408 cognates and about 60 phonological correspondences. These features are of two types cognates or typological data. Borrowings or false cognates can skew or obscure the correct data. These terms are believed to be cognates of the toponym "Atlas". He states that these supposed cognates can be useful to reconstruct the early Turkic language. Comparative linguist Kang Gil-un found 1300 Dravidian Tamil cognates in Korean. In linguistics, mama and papa are considered a special case of false cognates. One dictionary proposed the name developed in parallelism with "ladybird" and its Norse cognates.