The word "word" captures its own essence perfectly. It is an example of itself -- it is a word. It represents all the elements of the class it identifies -- all words.

There is no word or set of words that capture the essence of what is/awareness/being/suchness/reality/void/emptiness/whatever-you-want-to-call-it. The best that can be done with words is to point at the it that isn't even definable enough to be an it.