"replacer" meaning in English

{
  "categories": [
    {
      "kind": "other",
      "name": "Λέξεις με επίθημα -er (αγγλικά)",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_text": ": replacer < replace + -er",
  "forms": [
    {
      "form": "replacer"
    },
    {
      "form": "en-noun-s",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "replacer",
      "raw_tags": [
        "ενικός"
      ]
    },
    {
      "form": "replacers",
      "raw_tags": [
        "πληθυντικός"
      ]
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "milk"
    },
    {
      "word": "function"
    },
    {
      "word": "συνάρτηση"
    }
  ],
  "senses": [
    {
      "glosses": [
        "αντικατάσταση, αντικαταστάτης"
      ],
      "id": "el-replacer-en-noun-Sk0-XXiv"
    },
    {
      "glosses": [
        "υποκατάστατο"
      ],
      "id": "el-replacer-en-noun-dI-YBNpH"
    }
  ],
  "word": "replacer"
}

{
  "categories": [
    "Λέξεις με επίθημα -er (αγγλικά)"
  ],
  "etymology_text": ": replacer < replace + -er",
  "forms": [
    {
      "form": "replacer"
    },
    {
      "form": "en-noun-s",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "replacer",
      "raw_tags": [
        "ενικός"
      ]
    },
    {
      "form": "replacers",
      "raw_tags": [
        "πληθυντικός"
      ]
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "milk"
    },
    {
      "word": "function"
    },
    {
      "word": "συνάρτηση"
    }
  ],
  "senses": [
    {
      "glosses": [
        "αντικατάσταση, αντικαταστάτης"
      ]
    },
    {
      "glosses": [
        "υποκατάστατο"
      ]
    }
  ],
  "word": "replacer"
}