All 16 words, sorted alphabetically. Group them into four categories of four.
The four category names, easiest to hardest. No words revealed yet.
Theme name plus one word from each category.
CHARGE, FILE, INDICT, and SUE are all ways to take legal action against someone in court.
INKY, JET, PITCH, and RAVEN are all words used to describe the deepest shade of black (e.g., jet-black, pitch-black, raven-black, inky black).
CHER (of Sonny & Cher), CLYDE (of Bonnie & Clyde), HARDY (of Laurel & Hardy), and TELLER (of Penn & Teller) are all the second-named member of a famous real-life duo.
CHIP (of Chip 'n' Dale), ITCHY (of Itchy & Scratchy), PINKY (of Pinky and the Brain), and ROCKY (of Rocky and Bullwinkle) are all cartoon rodents who are the first-named member of their duo.