"Development of font independent thesaurus for Hindi language" is a topic under NLP. NLP is a field of computer science and linguistics concerned with the interactions between computers and human (natural) language. In this work basic of Hindi character set and the concept of font independent has also been discussed. The main part is engaged with thesaurus. Thesaurus has been made for Hindi language that will provide the synonyms and antonyms of the word in a given text file. Synonym are those words that means the same as another word whereas Antonym means the word with oppositeness in meaning. Thesaurus is usually embedded in the application program such as document analysis system and text retrieval system. Thesaurus provides a way to organize knowledge or information for subsequent retrieval. It describe the various solutions of the problems that arises during the implementation of Hindi thesaurus.