Sub Demo()
Application.ScreenUpdating = False
Dim Tbl As Table, FndList, RepList, i As Long
FndList = Array("Replace", "Do")
RepList = Array("Replaced", "Done")
With ActiveDocument
  For Each Tbl In .Tables
    With Tbl.Range.Find
      .ClearFormatting
      .Replacement.ClearFormatting
      .MatchWholeWord = True
      .Replacement.Text = "^&"
      .Wrap = wdFindStop
      For i = 0 To UBound(FndList)
        .Text = FndList(i)
        .Replacement.Text = RepList(i)
        .Execute Replace:=wdReplaceAll
      Next
    End With
  Next
End With
Application.ScreenUpdating = True
End Sub