WordNet can used to identify concept pretaining to a term, to suit them to full semantic richness and complexity of given information need.
(2) Document Summarization.
WordNet has found useful application in text summarization. Few approaches utilize information from WordNet to compute lexical chain.
(3) Automatic Query Expansion.
WordNet semantic relations can be used to expand queries so that search for document is not confined to pattern matching of query terms, but also cover synonyms.
(4) Word Sense Disambiguity
WordNet offers sense definations of words, identifies sunsets of synonyms,defines a number of semantics relations and is freely available.