"mulero" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "mula",
        "3": "-ero"
      },
      "expansion": "mula + -ero",
      "name": "af"
    }
  ],
  "etymology_text": "From mula + -ero.",
  "forms": [
    {
      "form": "muleros",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mulero m (plural muleros)",
      "name": "es-noun"
    }
  ],
  "hyphenation": [
    "mu‧le‧ro"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish terms suffixed with -ero",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "muleteer"
      ],
      "id": "en-mulero-es-noun-C~mdsWto",
      "links": [
        [
          "muleteer",
          "muleteer"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/muˈleɾo/"
    },
    {
      "ipa": "[muˈle.ɾo]"
    },
    {
      "rhymes": "-eɾo"
    }
  ],
  "word": "mulero"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "mula",
        "3": "-ero"
      },
      "expansion": "mula + -ero",
      "name": "af"
    }
  ],
  "etymology_text": "From mula + -ero.",
  "forms": [
    {
      "form": "muleros",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "mulero m (plural muleros)",
      "name": "es-noun"
    }
  ],
  "hyphenation": [
    "mu‧le‧ro"
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Rhymes:Spanish/eɾo",
        "Rhymes:Spanish/eɾo/3 syllables",
        "Spanish 3-syllable words",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish nouns",
        "Spanish terms suffixed with -ero",
        "Spanish terms with IPA pronunciation"
      ],
      "glosses": [
        "muleteer"
      ],
      "links": [
        [
          "muleteer",
          "muleteer"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/muˈleɾo/"
    },
    {
      "ipa": "[muˈle.ɾo]"
    },
    {
      "rhymes": "-eɾo"
    }
  ],
  "word": "mulero"
}