collective nouns

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Across
  1. 3. a number of events, objects, or people of a similar or related kind coming one after another
  2. 5. a flock or large body of birds or insects in the air
  3. 7. a system of millions or billions of stars, together with gas and dust
  4. 8. a group of ships sailing together
  5. 9. a small group of trees or plants growing closely together
Down
  1. 1. a group of people of one nationality or race living in a foreign place
  2. 2. a large group of animals
  3. 3. all the people employed by a particular organization
  4. 4. a set of different things of the same general type
  5. 6. a large or dense group of flying insects