The term 'set in opposition' can be broken down into two crossword solutions: PIT (3 letters) and CONTRAST (8 letters). The term 'set in opposition' implies that two things are being compared or contrasted, and the two crossword solutions reflect this. PIT is a noun that refers to a hole or depression in the ground, while CONTRAST is a verb that means to compare two or more things in order to show their differences. Together, these two words suggest that two things are being placed side by side in order to highlight their differences.