Look up a word, and get back not only defiinitions, but relevant keywords, and related terms galore. For semantics, I got: Keywords: Pragmatic, Syntax, Linguistic, Sentence, Phonology Related Terms: Wordnet , Dictionary, Vocabulary, Lexis, Ambiguity..
M. Baroni, and R. Zamparelli. Proceedings of the 2010 Conference on Empirical Methods in Natural Language Processing, page 1183--1193. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)