Heeheeheehaw

2. The title
9. A puzzle in which words are arranged horizontally and vertically, typically CROSSING at overlapping letters
12. The only English letter not containing the sound it makes
13. Another word for lexicon
14. The Greek letter and math symbol for 3.14...
16. A lung disease cause by inhaling microscopic volcanic ash
17. previously the 9th planet until 2006
20. A five sided shape
21. Person, place, or thing (plural)
23. To refuse
24. The ancestor of the modern keyboard
25. The Latin word for four
26. Twice pi (6.28...)
27. The keyboard layout

1. The current year
3. Also, in addition to
4. A puzzle in which words are hidden in a grid of letters and must be found
5. Wonderful, originally from Marry Poppins
6. An atom made of one electron and one proton
7. The prairie state
8. An ellipsoid shaped dwarf planet found in our solar system, its shape due to its fast rotation
10. Nothing
11. 1 followed by nine zeros
15. One of the largest black holes in the universe
18. A substance used in the nuclear field
19. An English letter that is no longer used, representing the "th" sound
20. The discontinued American currency worth one cent
22. The 6th planet known for its beautiful rings
28. Intelligence