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Word families and word clusters are other traditional lexicological groupings in which the words are grouped according to the root-morpheme, for example: dog, doggish, doglike, dogg), to dog, dogged, doggedly, doggedness, dog-days, dog-biscuit, dogcart, etc.
Word clustering is a technique for partitioning sets of words into subsets of semantically similar words and is increasingly becoming a major technique used in a number of semantic classifications ranging from word sense or structural disambiguation to information retrieval and filtering.