To inverse the words

Here's some very simple code to do it.

Sub ReverseList()
    Dim SS() As String
    Dim T As String
    Dim N As Long
    On Error GoTo ErrH:
    SS = Split(ActiveCell, "-")
    Application.EnableEvents = False
    For N = UBound(SS) To LBound(SS) Step -1
        T = T + SS(N) + "-"
    Next N
    T = Left(T, Len(T) - 1)
    ActiveCell.Value = T
ErrH:
    Application.EnableEvents = True
    Debug.Print T
End Sub

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Here's some very simple code to do it.

Sub ReverseList()
    Dim SS() As String
    Dim T As String
    Dim N As Long
    On Error GoTo ErrH:
    SS = Split(ActiveCell, "-")
    Application.EnableEvents = False
    For N = UBound(SS) To LBound(SS) Step -1
        T = T + SS(N) + "-"
    Next N
    T = Left(T, Len(T) - 1)
    ActiveCell.Value = T
ErrH:
    Application.EnableEvents = True
    Debug.Print T
End Sub

Okay, one more way to reverse the sequence of words in the string is to use VBA, especially taking into account the reverse is to be done in the same cell.

Lot of samples exists. Code below works if stay on the cell and run that macro

Sub ReverseWords()

Dim InputStr As String
Dim ResultStr As String
Dim InputArray() As String
Dim OutputStr As String
Dim SeparatorStr As String
Dim WordsCount As Integer
Dim WorkRng As Range

SeparatorStr = "-"

'Take string from selected cell
Set WorkRng = Application.Selection
InputStr = WorkRng.Value

'Split and put into an array
InputArray = Split(InputStr, SeparatorStr)
WordsCount = UBound(InputArray)

'Combine all the words in reverse
ResultStr = ""
xSep = ""
For i = WordsCount To 0 Step -1
    If i = 0 Then
        xSep = ""
    Else: xSep = "-"
    End If
ResultStr = ResultStr & InputArray(i) & xSep
Next
WorkRng.Value = ResultStr

End Sub

I believe it could be expanded on the case when range of cells is selected to reverse words in each of it.

Oliver's solution is great where one-off transformations are required, which may apply to many situations. If you wish to automate the process, so it can be resused in the future, you can use a combination of FIND, LEFT, RIGHT and CONCATENTATE functions. Please see the attached file for a possible solution. Alternatively, you can use Power Query ('Get & Transform' in Excel 2016) to automate the transformations.