Specialized dictionaries can be classified in various ways. A dictionary that covers more than one subject field is called a multi-field dictionary; one that covers one subject field is called a single-field dictionary; and one that covers a limited part of a subject field is called a sub-field dictionary.
A specialized dictionary that attempts to cover as much of the relevant terminology as possible is called a maximizing dictionary, whereas one that attempts to cover only a limited part of the relevant terminology is called a minimizing dictionary.
Specialized dictionaries can have various functions, i.e. they can help users in different types of situation. Monolingual dictionaries can help users understand and produce texts, whereas bilingual dictionaries can help users understand texts, translate texts and produce texts.