Depending on what you mean by 'word' this is probably harder than you might
imagine. Something like this should normally work ...
Dim ParaRef As Paragraph
Dim WordNum As Long
' Get a reference to your paragraph, for example
Set ParaRef = ActiveDocument.Range.Paragraphs(1)
' Scan backwards, avoiding para mark and punctuation
For WordNum = ParaRef.Range.Words.Count To 1 Step -1
If Len(ParaRef.Range.Words(WordNum)) > 1 Then
ParaRef.Range.Words(WordNum).Select
Exit For
End If
Next