Hint 1
The first word refers to a book bound in a stiff, durable cover (like cardboard or cloth), and the second word is the SI unit of thermodynamic temperature, equal in magnitude to the degree Celsius.
Hint 2
The first word starts with the letter H.
Hint 3
You only need two words! The first word is 8 letters long, and the second word is 6 letters long.
Today's Letter Boxed Solution
