The Hindi WordNet is a system for bringing together different lexical and semantic relations between the Hindi words. It organizes the lexical information in terms of word meanings and can be termed as a lexicon based on psycholinguistic principles. The design of the Hindi WordNet is inspired by the famous English WordNet.
You can browse the Hindi Wordnet through this interface. It is more than a conventional Hindi dictionary. It gives different relations between synsets or synonym sets which represent unique concepts.