'er' words

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Across
  1. 2. The word for a group of sheep or cattle
  2. 6. Another word for maybe
  3. 8. Used to add flavour to food like spices
  4. 9. A type of metal often used to make jewellry
  5. 11. We have many of these in our bodies. They send messages to the brain.
Down
  1. 1. The female version of he
  2. 3. Skilled, professional, knowledgeable
  3. 4. Parts of a song or poem
  4. 5. The name of the person that looks after sheep
  5. 7. A female sibling
  6. 10. The name for a doing word