Bonjour,
Peut-être comme ça: code à mettre dans le Module de la Feuille
Option Explicit: Option Compare Text
Private Sub Worksheet_Change(ByVal Target As Range)
Dim i As Long, DerLig As Long, C As Range
DerLig = Range("D" & Rows.Count).End(xlUp).Row
If Not Intersect(Target, [A5]) Is Nothing Then
Set C = Sheets("Feuil1").Columns("D").Find(What:=Target)
For i = 1 To DerLig
If Not IsEmpty(C) And Cells(i, 4) Like "*" & C & "*" Then MsgBox "le mot '" & C & "' se trouve dans la cellule " & Cells(i, 4).Address
Next i
End If
End Sub
Bonne journée