1. A speech recognition system for recognition of spoken speech of a language, the speech recognition system comprising: a vocabulary including a multitude of words of said language recognizable by said speech recognition system, the vocabulary comprising entries identical to legal words of said language and entries that are constituents of legal words of said language, said constituents being arbitrary sub-components of said legal words according to their orthography, wherein said constituents are not required to be related to speech recognition units and are selected to achieve a compression of said vocabulary.