Prefix mono-

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Across
  1. 1. a word that has only one syllable
  2. 3. control of a product or service by one company
  3. 5. fear of being alone
  4. 6. a track for a train that has only one rail line
  5. 7. an eyeglass for one eye
Down
  1. 1. a painting, design, or outfit that is only one color
  2. 2. something made out of one single large block or piece of stone
  3. 4. a long speech given by one person
  4. 6. a speech that has the same tone of voice