Пак проблема идва от двете къдрави скоби в края на кода.

Опитай така:

import java.util.Scanner;

public class EqualsWords {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String word1 = scanner.nextLine();
        String word2 = scanner.nextLine();

        if (word1.equalsIgnoreCase(word2)) {
            System.out.println("yes");
        } else {
            System.out.println("no");
        }
    }
}

:)

import java.util.Scanner;

public class Nums100 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String firstWord = scanner.nextLine();
        String secondWord = scanner.nextLine();
        
        firstWord = firstWord.toUpperCase();
        secondWord = secondWord.toUpperCase();
        
        if (firstWord.equals(secondWord)) {
            System.out.println("yes");
        }else {
            System.out.println("no");

        }
    }
}