Selection.Extend (Word)

Turns on extend mode, or if extend mode is already on, extends the selection to the next larger unit of text.

Using this method sets the ExtendMode property to True if it is not already. The progression of selected units of text is as follows: word, sentence, paragraph, section, entire document. If Character is specified, this method extends the selection forward through the next instance of the specified character. The selection is extended by moving the active end of the selection.

Extend (Character)

Character: The character through which the selection is extended. This argument is case-sensitive and must evaluate to a String or an error occurs. Also, if the value of this argument is longer than a single character, Microsoft Word ignores the command entirely.

With Selection 
 ' Collapse current selection to insertion point. 
 .Collapse 
 ' Turn extend mode on. 
 .Extend 
 ' Extend selection to word. 
 .Extend 
 ' Extend selection to sentence. 
 .Extend 
End With