Nouns and apostrophes

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Across
  1. 1. used to show possession or when a letter is omitted (left out)
  2. 4. a name, place or object
  3. 5. a specific place, item or person
  4. 6. a general name, place or object
Down
  1. 2. used as a substitute when you have already used a specific noun
  2. 3. one person, place or object