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.
BROWN, CHAR, GRILL, and SEAR are all methods of cooking food in a pan or over direct heat, typically creating a browned or caramelized exterior.
ANVIL, CANAL, DRUM, and HAMMER are all parts of the ear — the ear canal, the eardrum, and the hammer (malleus) and anvil (incus) bones in the middle ear.
CHARCOAL, JET, RAVEN, and SABLE are all words used to describe shades of black or very dark colors.
A GOLF BAG holds a driver (a golf club), a LIMOUSINE has a driver (chauffeur), a MOVIE SET has a driver (crew member who transports talent), and a TOOLBOX contains a driver (screwdriver).