Sub Macro1()
'Graham Mayor - http://www.gmayor.com - Last updated - 13 Jun 2017 
Const sFind As String = "posting|question"
Dim vFind As Variant
Dim oRng As Range
Dim i As Integer
    vFind = Split(sFind, "|")
    For i = 0 To UBound(vFind)
        Set oRng = ActiveDocument.Range
        With oRng.Find
            Do While .Execute(FindText:=vFind(i))
                Select Case i
                    Case Is = 0
                        oRng.Start = oRng.Start + 2
                    Case Is = 1
                        oRng.Start = oRng.Start + 3
                End Select
                oRng.End = oRng.Start + 2
                oRng.Font.ColorIndex = wdRed
                oRng.Collapse 0
            Loop
        End With
    Next i
End Sub

Sub Macro2()
'Graham Mayor - http://www.gmayor.com - Last updated - 13 Jun 2017
Dim oRng As Range
Const strList As String = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
    Set oRng = ActiveDocument.Range
    With oRng.Find
        .Font.ColorIndex = wdRed
        Do While .Execute
            oRng.MoveEndWhile strList
            oRng.MoveStartWhile strList, wdBackward
            'do something with the word e.g.
            oRng.Font.ColorIndex = wdBlue
            'end of word process
            oRng.Collapse 0
        Loop
    End With
End Sub