diff --git a/game/components/Receiver.ts b/game/components/Receiver.ts
index 97e0026..de78121 100644
--- a/game/components/Receiver.ts
+++ b/game/components/Receiver.ts
@@ -63,13 +63,17 @@ export class Receiver {
 				case "sendClue":
 					console.log('Case sendClue reached');
 					let legalClue: boolean = RuleEnforcer.isLegalClue(message.clue);
+					let isWordOnBoard: boolean = RuleEnforcer.isWordOnBoard(message.clue, this.game.board.cards);
 					let theirTurn: boolean = RuleEnforcer.isPlayerTurn(this.game, this.game.getPlayerById(message.id));
 					let validNum: boolean = RuleEnforcer.isValidNum(message.clue)
-					if(legalClue && theirTurn && validNum) {
+					if(legalClue && !isWordOnBoard && theirTurn && validNum) {
 						this.game.initializeClue(message.clue);
 					} else {
-						if(!legalClue) {
-							socket.send(JSON.stringify({ action: "invalidClueWord", }));
+						if(isWordOnBoard){
+							socket.send(JSON.stringify({ action: "invalidClueWord", reason: "wordOnBoard"}));
+						}
+						else if(!legalClue) {
+							socket.send(JSON.stringify({ action: "invalidClueWord", reason: "notWord"}));
 						}
 						else if(!validNum) {
 							socket.send(JSON.stringify({ action: "invalidClueNum", }));
diff --git a/game/components/RuleEnforcer.ts b/game/components/RuleEnforcer.ts
index 165f4f0..0fb9530 100644
--- a/game/components/RuleEnforcer.ts
+++ b/game/components/RuleEnforcer.ts
@@ -11,7 +11,7 @@ import { Team, Turn } from '../constants/Constants';
 import { Game } from './Game'
 
 export module RuleEnforcer {
-  export function isValidName(name) { return name.length > 0; }
+  export function isValidName(name) { return name.length > 0 ; }
   
   export function isValidNum(clue) {
     return clue.num >= 0 && clue.num <= 9;
@@ -21,6 +21,10 @@ export module RuleEnforcer {
     return words.check(clue.word.toLocaleLowerCase());
   }
 
+  export function isWordOnBoard(clue: Clue, cards: Card[]): boolean {
+    return cards.filter(card => card.word.toLocaleLowerCase() === clue.word.toLocaleLowerCase()).length > 0;
+  }
+
   export function isPlayerTurn(game: Game, player: SPlayer) {
     return game.currTeam === player.team && game.turn === player.role;
   }