*Letter [ˈletər]-noun a character representing one or more of the sounds used in speech; any of the symbols of an alphabet : a capital letter. *Word [wurd]–noun a unit of language, consisting of one or more spoken sounds or their written representation, that functions as a principal carrier of meaning. Words are composed of one or more morphemes and are either the smallest units susceptible of independent use or consist of two or three such units combined under certain linking conditions, as with the loss of primary accent that distinguishes blackbird from black bird. Words are usually separated by spaces in writing, and are distinguished phonologically, as by accent, in many languages. *Number [ˈnəmbər]-noun an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity. *Ze·ro [zeer-oh]-noun the figure or symbol 0, which stands for the absence of quantity; cipher. *Zero is a unit of language consisting of four characters used to represent the figure or symbol 0. *'Zero' is a word.
