As we can see from the partial POS lexicon for English in Figure 1, "the" is unambiguous with respect to POS tagging, since it can only be a determiner (DT), whereas "sting" is ambiguous, since it can be a common noun (NN), a proper noun (NNP) or a verb (VB).
schütze (1995) and Clark (2000) apply syntactic clustering and dimensionality reduction in a knowledge-free setting to obtain meaningful clusters.