add character in correct position in vba

I have two words

hilux  
hi-lux


I have ascertained the position of the hyphen in StringWords2(index2) how do i insert that hyphen into the same position in StringWords1(index)?

I have previously determined that removal of the hyphen would lead to a match of words.

but I want to insert and not remove it.

'traverse array and compare the words
        
    For index = LBound(StringWords1()) To UBound(StringWords1())
    For index2 = LBound(StringWords2()) To UBound(StringWords2())
    
    If Replace(StringWords2(index2), "-", "") = StringWords1(index) Then
  
    hypenPos = InStr(1, StringWords2(index2), "-", vbTextCompare)
    Else
   
    
    End If

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