"royal duck" meaning in English

{
  "forms": [
    {
      "form": "royal ducks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "royal duck (plural royal ducks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cricket",
          "orig": "en:Cricket",
          "parents": [
            "Ball games",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of platinum duck"
      ],
      "id": "en-royal_duck-en-noun-evclWvQA",
      "links": [
        [
          "cricket",
          "cricket"
        ],
        [
          "platinum duck",
          "platinum duck#English"
        ]
      ],
      "raw_glosses": [
        "(cricket) Synonym of platinum duck"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "platinum duck"
        }
      ],
      "topics": [
        "ball-games",
        "cricket",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "royal duck"
}

{
  "forms": [
    {
      "form": "royal ducks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "royal duck (plural royal ducks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "en:Cricket"
      ],
      "glosses": [
        "Synonym of platinum duck"
      ],
      "links": [
        [
          "cricket",
          "cricket"
        ],
        [
          "platinum duck",
          "platinum duck#English"
        ]
      ],
      "raw_glosses": [
        "(cricket) Synonym of platinum duck"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "platinum duck"
        }
      ],
      "topics": [
        "ball-games",
        "cricket",
        "games",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "royal duck"
}