Independent memory in most languages is an important part of the essence or where is called the root or element (root), such as bean, beans in slowly, slow in use in useful, etc.
The independent authority on the language most often or a significant part of which is called the core or root element (root) such as bean in beans, slow in slowly, use a useful example.
Free morphemes in language most often is the core or core, which is called the root word or element (such as bean root), in beans slow in slowly. Use in useful, etc.