What is a "word" and what is then "what" ? When I went to school the teacher told me that there were sentences and there were words and that these items were used to express some "meaning". But he never explained me really what a sentence is, except to be a sequence of words, and he never told me what a word is, just how they were used. As an example, lets take this small little word "what" and ask "what is what" ? How can this word be explained as what it is ? How can the term "word" be explained as a general term, not as used for only one function.