"senior synonym" meaning in English

{
  "forms": [
    {
      "form": "senior synonyms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "senior synonym (plural senior synonyms)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Zoology",
          "orig": "en:Zoology",
          "parents": [
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "In zoological nomenclature, a name which describes the same taxon as one or more subsequently published names."
      ],
      "id": "en-senior_synonym-en-noun-PereKWQw",
      "links": [
        [
          "zoology",
          "zoology"
        ],
        [
          "zoological",
          "zoological"
        ],
        [
          "nomenclature",
          "nomenclature"
        ],
        [
          "taxon",
          "taxon"
        ]
      ],
      "raw_glosses": [
        "(zoology) In zoological nomenclature, a name which describes the same taxon as one or more subsequently published names."
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "zoology"
      ]
    }
  ],
  "word": "senior synonym"
}

{
  "forms": [
    {
      "form": "senior synonyms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "senior synonym (plural senior synonyms)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Zoology"
      ],
      "glosses": [
        "In zoological nomenclature, a name which describes the same taxon as one or more subsequently published names."
      ],
      "links": [
        [
          "zoology",
          "zoology"
        ],
        [
          "zoological",
          "zoological"
        ],
        [
          "nomenclature",
          "nomenclature"
        ],
        [
          "taxon",
          "taxon"
        ]
      ],
      "raw_glosses": [
        "(zoology) In zoological nomenclature, a name which describes the same taxon as one or more subsequently published names."
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "zoology"
      ]
    }
  ],
  "word": "senior synonym"
}