No java ! here is my code golf version

  var map =
      new BufferedReader(new InputStreamReader(in, UTF_8))
          .lines()
          .flatMap(compile(" ")::splitAsStream)
          .collect(groupingBy(w -> w, () -> new TreeMap<>(reverseOrder()), counting()));

It obviously doesn't work without the imports

  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.util.TreeMap;

  import static java.lang.System.in;
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static java.util.Collections.reverseOrder;
  import static java.util.regex.Pattern.compile;
  import static java.util.stream.Collectors.counting;
  import static java.util.stream.Collectors.groupingBy;