"plutonium bomb" meaning in English

{
  "forms": [
    {
      "form": "plutonium bombs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "plutonium bomb (plural plutonium bombs)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Explosives",
          "orig": "en:Explosives",
          "parents": [
            "Matter",
            "Weapons",
            "Chemistry",
            "Nature",
            "Hunting",
            "Military",
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          "kind": "topical",
          "langcode": "en",
          "name": "Nuclear warfare",
          "orig": "en:Nuclear warfare",
          "parents": [
            "War",
            "Weapons",
            "Conflict",
            "Military",
            "Violence",
            "Hunting",
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            "Fundamental"
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      ],
      "glosses": [
        "A plutonium-fired nuclear bomb."
      ],
      "id": "en-plutonium_bomb-en-noun-T6SKXmvq",
      "links": [
        [
          "nuclear bomb",
          "nuclear bomb"
        ]
      ]
    }
  ],
  "word": "plutonium bomb"
}

{
  "forms": [
    {
      "form": "plutonium bombs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "plutonium bomb (plural plutonium bombs)",
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  "lang_code": "en",
  "pos": "noun",
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        "en:Explosives",
        "en:Nuclear warfare"
      ],
      "glosses": [
        "A plutonium-fired nuclear bomb."
      ],
      "links": [
        [
          "nuclear bomb",
          "nuclear bomb"
        ]
      ]
    }
  ],
  "word": "plutonium bomb"
}