“One word substitutes” as the phrase indicates itself are the words that replace group of words or a full sentence effectively without creating any kind of ambiguity in the meaning of the sentences. Like the word “Autobiography” can be used in place of the sentence “The life story of a man written by himself”. It is very important to write precisely and speak in a single word. Generally, we speak or write in a garrulous way. But, it is seen that precise words are always understood easily by all. At times we become verbose which is not required and we are required to talk or speak precisely. This not only makes the language easily comprehendible but also makes it beautiful. The other way, we can say that these words are used to bring an effect of compression in any kind of writing, for example in business communication there are instances when we have to write a lot with in limitation of time and space, there these kind of words can prove quite handy. In English language there are a lots of single words for a group of words that can be used effectively to make the writing to the point that too without losing the meaning of the context.