"ground water" meaning in English

{
  "forms": [
    {
      "form": "ground waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ground water (countable and uncountable, plural ground waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "groundwater"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "Entry maintenance"
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
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          "kind": "topical",
          "langcode": "en",
          "name": "Liquids",
          "orig": "en:Liquids",
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            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of groundwater"
      ],
      "id": "en-ground_water-en-noun-S8OsKLWa",
      "links": [
        [
          "groundwater",
          "groundwater#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "ground water"
}

{
  "forms": [
    {
      "form": "ground waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ground water (countable and uncountable, plural ground waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "groundwater"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Geology",
        "en:Liquids"
      ],
      "glosses": [
        "Alternative form of groundwater"
      ],
      "links": [
        [
          "groundwater",
          "groundwater#English"
        ]
      ],
      "tags": [
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  ],
  "word": "ground water"
}