There are some nouns ending in ‘y’ that make their plurals by removing‘y’ and adding ‘ies’.

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Across
  1. 5. lady
  2. 8. story
  3. 9. city
  4. 10. diary
  5. 11. hobby
Down
  1. 1. lorry
  2. 2. fly
  3. 3. army
  4. 4. baby
  5. 6. pony
  6. 7. puppy