The program can read over 110 languages with three alphabets: Latin, Greek and Cyrillic. See the list in the OCR panel of the Options dialog box. It shows which languages have dictionary support. A listing is also provided on the Nuance web site.
In addition to user dictionaries, specialized dictionaries are available for certain professions (currently medical, legal and financial) for some languages. See the list and make selections in the OCR panel of the Options dialog box.