Discuss the following lexicographical concepts showing what they mean their purpose and what they contain o Onomasiology and Semasiology approaches

Discuss the following lexicographical concepts showing what they mean, their purpose and what they contain?
o Onomasiology and Semasiology approaches
o A Dictionary and a Thesaurus
o Glossary and Translation Glossary
o List of lexical Databases.
o Specialty Dictionaries.