diff --git a/allgemein.php b/allgemein.php
index b4de354..79938b9 100644
--- a/allgemein.php
+++ b/allgemein.php
@@ -116,5 +116,36 @@
             </div>
         </form>
     </div>
+    <script>
+        document.getElementById("input_deutsch").onblur = function() {
+            let wortAnzahl = 0;
+            let wort = document.getElementById("input_deutsch").value;
+
+            if(wort != '') {
+                fetch("forms/pruefeDuplikat.php", {
+                    method: "POST",
+                    headers: {"Content-Type": "application/json"},
+                    body: JSON.stringify({ wort: wort})
+                })
+                .then(r => r.json())
+                .then(data => {
+                    item = data;
+                    if(item > 0) doppeltesWortGefunden(true);
+                    else doppeltesWortGefunden(false)
+                });
+
+                function doppeltesWortGefunden(gefunden) {                    
+                    if(gefunden) {
+                        document.getElementById("input_deutsch").style.color = "red";
+                        document.getElementById("input_deutsch").value = document.getElementById("input_deutsch").value + "   ! WORT BEREITS VORHANDEN !";
+                        document.getElementById("div_speichern").style.display = "none";
+                    } else {
+                        document.getElementById("input_deutsch").style.color = "black";
+                        document.getElementById("div_speichern").style.display = "flex";
+                    }
+                }
+            }
+        };
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/forms/pruefeDuplikat.php b/forms/pruefeDuplikat.php
new file mode 100644
index 0000000..1738da4
--- /dev/null
+++ b/forms/pruefeDuplikat.php
@@ -0,0 +1,16 @@
+<?php
+    require_once __DIR__ . '/../includes/db_connect.php';
+
+	$data = json_decode(file_get_contents("php://input"), true);
+
+	$wort = $data['wort'] ?? '';
+    
+	header('Content-Type: application/json');
+
+    $stmt = $pdo->prepare("SELECT COUNT(*)
+                            FROM deutsch
+                            WHERE LOWER(wort) = LOWER(:wort);");
+    $stmt->execute(['wort' => $wort]);
+    $wortAnzahl = $stmt->fetchColumn();
+
+    echo json_encode($wortAnzahl);
\ No newline at end of file
diff --git a/verben.php b/verben.php
index a0df0af..d5f3bb6 100644
--- a/verben.php
+++ b/verben.php
@@ -97,5 +97,36 @@
             </div>
         </form>
     </div>
+    <script>
+        document.getElementById("input_deutsch").onblur = function() {
+            let wortAnzahl = 0;
+            let wort = document.getElementById("input_deutsch").value;
+
+            if(wort != '') {
+                fetch("forms/pruefeDuplikat.php", {
+                    method: "POST",
+                    headers: {"Content-Type": "application/json"},
+                    body: JSON.stringify({ wort: wort})
+                })
+                .then(r => r.json())
+                .then(data => {
+                    item = data;
+                    if(item > 0) doppeltesWortGefunden(true);
+                    else doppeltesWortGefunden(false)
+                });
+
+                function doppeltesWortGefunden(gefunden) {                    
+                    if(gefunden) {
+                        document.getElementById("input_deutsch").style.color = "red";
+                        document.getElementById("input_deutsch").value = document.getElementById("input_deutsch").value + "   ! WORT BEREITS VORHANDEN !";
+                        document.getElementById("div_speichern").style.display = "none";
+                    } else {
+                        document.getElementById("input_deutsch").style.color = "black";
+                        document.getElementById("div_speichern").style.display = "flex";
+                    }
+                }
+            }
+        };
+    </script>
 </body>
 </html>
\ No newline at end of file