Bilingual synonym dictionaries are designed for language learners. There are some broad differences between encyclopedias and dictionaries. The lexicographic order has thus been introduced for sorting the entries of dictionaries and encyclopedias. See Pronunciation respelling for English for phonetic transcriptions used in different dictionaries. Thus encyclopedias may contain material that is also found in dictionaries, and vice versa. The word appears in several major English language dictionaries. It has the most languages among Korean dictionaries. Stress marks are mandatory in lexical dictionaries and books for children or Russian learners. Certain dictionaries, such as , provide a single pronunciation. Writers who create dictionaries are called lexicographers. Encyclopedia entries are longer and more detailed than those in most dictionaries. This list contains all OWL2 words plus words sourced from Chambers and Collins English dictionaries. The symbol used for it in phonetic notations in Romanian dictionaries is . It includes a number of periodicals, textbooks, dictionaries and audio-visual materials. There are two standards for listing verbs in dictionaries.