The documentation is incorrect. You should have gotten this output:

{
  en => [
    "angst bunny",
    "badge bunny",
    "bunny girl",
    "bunny rabbit",
    "cuddle bunny",
    "dust bunny",
    "Easter Bunny",
    "gym bunny",
    "snuggle bunny",
    "that's the bunny",
    "bunny wunny",
    "snow bunny"
  ]
}
{
  en => {
    language => "English",
    sense => {
      "easy, unchallenging, of a slope" => [
        "nursery"
      ],
      "resembling a bun" => [
        "bunlike"
      ]
    }
  }
}
[download]

You'll have to improvise:)