Nick’s puzzle title

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Across
  1. 5. marked by or causing extremely funny
  2. 7. a branch of mathematics that deals with the measurement, properties, and relationships of points, lines, angles, surfaces, and solids
  3. 8. a statement of the meaning of a word or word group or a sign or symbol
  4. 9. a generalization of arithmetic in which letters representing numbers are combined according to the rules of arithmetic
  5. 10. any of the four substances air, water, fire, and earth formerly believed to compose the physical universe
  6. 13. a handy-sized unit of building or paving material typically being rectangular and made of moist clay hardened by heat
  7. 14. a metallic vessel usually used for boiling liquids
Down
  1. 1. any of various neutral compounds of carbon, hydrogen, and oxygen (such as sugars, starches, and celluloses) most of which are formed by green plants and which constitute a major class of animal foods
  2. 2. a sweet crystallizable material that consists wholly or essentially of sucrose
  3. 3. writings in prose or verse
  4. 4. a large keyboard musical instrument with a wooden case enclosing a soundboard and metal strings
  5. 6. a light low-cut shoe that is easily slipped on the foot
  6. 9. the act or state of applying the mind to something
  7. 11. : writings having excellence of form or expression and expressing ideas of permanent or universal interest
  8. 12. wealth (such as money, jewels, or precious metals) stored up or hoarded