"-sel" meaning in Norwegian Bokmål

{
  "etymology_templates": [
    {
      "args": {
        "1": "nb",
        "2": "non",
        "3": "-sl"
      },
      "expansion": "Old Norse -sl",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Norse -sl, -sla.",
  "head_templates": [
    {
      "args": {
        "1": "nb",
        "2": "suffix",
        "g": "m",
        "g2": "f"
      },
      "expansion": "-sel m or f",
      "name": "head"
    }
  ],
  "lang": "Norwegian Bokmål",
  "lang_code": "nb",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Norwegian Bokmål entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Norwegian Bokmål suffixes with multiple genders",
          "parents": [
            "Suffixes with multiple genders",
            "Suffixes by gender",
            "Suffixes",
            "Morphemes",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 11 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "used to form nouns from verbs."
      ],
      "id": "en--sel-nb-suffix-bKu4VVQM",
      "tags": [
        "feminine",
        "masculine",
        "morpheme"
      ]
    }
  ],
  "word": "-sel"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "nb",
        "2": "non",
        "3": "-sl"
      },
      "expansion": "Old Norse -sl",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Norse -sl, -sla.",
  "head_templates": [
    {
      "args": {
        "1": "nb",
        "2": "suffix",
        "g": "m",
        "g2": "f"
      },
      "expansion": "-sel m or f",
      "name": "head"
    }
  ],
  "lang": "Norwegian Bokmål",
  "lang_code": "nb",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Norwegian Bokmål entries with incorrect language header",
        "Norwegian Bokmål feminine suffixes",
        "Norwegian Bokmål lemmas",
        "Norwegian Bokmål masculine suffixes",
        "Norwegian Bokmål noun-forming suffixes",
        "Norwegian Bokmål suffixes",
        "Norwegian Bokmål suffixes with multiple genders",
        "Norwegian Bokmål terms derived from Old Norse",
        "Pages with 11 entries",
        "Pages with entries"
      ],
      "glosses": [
        "used to form nouns from verbs."
      ],
      "tags": [
        "feminine",
        "masculine",
        "morpheme"
      ]
    }
  ],
  "word": "-sel"
}