"-er" meaning in Breton

{
  "head_templates": [
    {
      "args": {
        "1": "br",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Breton entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "3 3 5 0 0 0 0 0 0 2 0 0 1 0 1 1 1 1 0 0 1 0 1 1 0 0 0 1 0 2 0 1 0 1 1 1 1 1 0 0 1 0 1 1 1 1 1 1 1 0 1 1 0 1 0 2 2 3 3 1 1 0 2 0 0 2 2 1 1 2 2 2 0 1 2 1 1 3 2 3 3 2 0 2 1 2 1 1 1 2 2 1 0 1",
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "brezhoneg (“Breton (language)”) + -er → brezhoneger (“Breton-speaker”)",
          "type": "example"
        },
        {
          "text": "c'hoari (“game; to play”) + -er → c'hoarier (“player, actor”)",
          "type": "example"
        },
        {
          "text": "tredan (“electricity”) + -er → tredaner (“electrician”)",
          "type": "example"
        }
      ],
      "glosses": [
        "person or thing that (does the action indicated by the root); used to form an agent noun."
      ],
      "id": "en--er-br-suffix-WYRLf4uC",
      "links": [
        [
          "person",
          "person"
        ],
        [
          "thing",
          "thing"
        ],
        [
          "agent noun",
          "agent noun#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɛʁ/"
    }
  ],
  "word": "-er"
}

{
  "categories": [
    "Pages with raw sortkeys"
  ],
  "head_templates": [
    {
      "args": {
        "1": "br",
        "2": "suffix"
      },
      "expansion": "-er",
      "name": "head"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Breton entries with incorrect language header",
        "Breton lemmas",
        "Breton suffixes",
        "Breton terms with IPA pronunciation",
        "Pages with raw sortkeys"
      ],
      "examples": [
        {
          "text": "brezhoneg (“Breton (language)”) + -er → brezhoneger (“Breton-speaker”)",
          "type": "example"
        },
        {
          "text": "c'hoari (“game; to play”) + -er → c'hoarier (“player, actor”)",
          "type": "example"
        },
        {
          "text": "tredan (“electricity”) + -er → tredaner (“electrician”)",
          "type": "example"
        }
      ],
      "glosses": [
        "person or thing that (does the action indicated by the root); used to form an agent noun."
      ],
      "links": [
        [
          "person",
          "person"
        ],
        [
          "thing",
          "thing"
        ],
        [
          "agent noun",
          "agent noun#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɛʁ/"
    }
  ],
  "word": "-er"
}