Semantic Relationship Crossword Puzzle

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Across
  1. 2. Base of a mountain
  2. 6. Opposite of prolific
  3. 8. A star in a constellation
  4. 11. A homophone for there
  5. 13. Celestial body orbiting a star
  6. 15. Component of sonnet
  7. 16. Spring blooming bulb
Down
  1. 1. A book in a series
  2. 3. A season of the year
  3. 4. Antonym of abstract
  4. 5. A unit of currency
  5. 7. Variety of gemstone
  6. 9. Fragment of a broken substance
  7. 10. Fundamental unit of the nervous system
  8. 12. Synonym for fast
  9. 14. Synonym for ephemeral