Words beginning with n

123456
Across
  1. 4. - a system for counting
  2. 5. - not at all
  3. 6. - the world around us
Down
  1. 1. - close to
  2. 2. - when the sun falls
  3. 3. - a number
  4. 4. - without anything
  5. 5. - after the first
  6. 6. - opposite to yes