If it is just the main text area of the document you are concerned with then this should do:
Code:
Sub ScratchMacro()
'A basic Word macro coded by Greg Maxey
Dim oRng As Word.Range
Set oRng = ActiveDocument.Range
With oRng.Find
.Text = "in"
.ClearFormatting
.Font.Name = "Courier New"
.Replacement.ClearFormatting
.Replacement.Font.Color = RGB(255, 119, 0)
.Execute Replace:=wdReplaceAll
End With
End Sub