Oh well its not about grammar but I just don't know how to call it you can tell me what is most needed to mean a word, can't you ? For example, if i say "a turtle", 'a' is an article in english, turtle is a countable noun. before any countable noun there must always be an article indicating 'defined' or 'undefined'. In that case, the turtle is undefined but after this example, you begin to understand the turtle, so it is from now the turtle not a turle is to be said. So, 'a' as what i say is a word ?