싸이월드 만들기 4탄 질문

id="myword"가 떡하니 있는데 왜저럴까요..
let lastword = word[word.length-1]
let firstword = myword[0]
부분도 let 선언이 안되는것같습니다 ㅠ

game.html:

<!DOCTYPE html>
<html lang="ko">
<head>
    
    <title>Game</title>
    <link href="./styles/game.css" rel="stylesheet">
    <script src="./game.js"></script>
</head>
<body>
    <div class="wrapper">
        <div class="wrapper__header">
            <div class="header__title">
                <div class="title">GAME</div>
                <div class="subtitle">TODAY CHOICE</div>
            </div>
            <div class="divideLine"></div>
        </div>
        <div class="game__container">
            <img src="./images/word.png">
            <div class="game__title">끝말잇기</div>
            <div class="game__subtitle">제시어 : <span id="word">코드캠프</span> </div>
            <div class="word__text">
                <input class="textbox" id="myword" placeholder="단어를 입력하세요">
                <button class="search" onclick="startWord()">입력</button>
            </div>
            <div class="word__result" id="result">결과!</div>

        </div>
        <div class="game__container">
            <img src="./images/lotto.png">
            <div class="game__title">LOTTO</div>
            <div class="game__subtitle"> 버튼을 누르세요. </div>
            <div class="lotto__text">
                <div class="number__box">
                    <span class="number1">3</span>
                    <span class="number1">5</span>
                    <span class="number1">10</span>
                    <span class="number1">24</span>
                    <span class="number1">30</span>
                    <span class="number1">34</span>
                </div>
                <button class="lotto_button">추첨</button>
            </div>
            


        </div>

    </div>
</body>
</html>

game.js:

const startWord = () => {
    let myword = document.getElementById("").value
    let word = document.getElementById("word").innerText

    let lastword = word[word.length-1]
    let firstword = myword[0]

    if(lastword === firstword){
        document.getElementById("result").innerText = "정답입니다"
        document.getElementById("word").innerText = myword
        docement.getElementById("myword").value = ""
    } else {
        document.getElementById("result").innerText="떙!"
        docement.getElementById("myword").value = ""
    }
}

인프런 커뮤니티 질문&답변