while ($answer <= 9) {
    if ($answer eq $numbers[$i]) {
        $answer = $words[$i];
        $i++;
        $answer;
                
    } else {
        #print $answer;
    } # end if

 } # end while
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Well, $answer here is a word like "eight", and the problem with the loop condition is that you cannot numerically compare "eight" to 9.

OK, let me give you a hint: When the user inputs 8, you want to print $words[7], don't you? Notice that 7 is 8-1? ;)