Nighantu 's a Sanskrit term for a traditional collection of words, grouped into thematic categories, often with brief annotations. Such collections share characteristics with glossaries and thesauri, but aren't true lexicons, such as the kośa of Sanskrit literature. Particular collections are also called . While a number of nighantavas devoted to specialized subjects exist, the eponymous Nighantu of the genre's an ancient collection, handed down from Vedic times. It was the subject of the N… (More on Nighantu)