Enter a clue or pattern or both:
The Clue
"Cloth diaper" or "film camera" (8 letter answer)
The Answer
RETRONYM
Tags
Notes
The answer RETRONYM is so rare that it appears less than once every 2500 puzzles.
Definition
RETRONYM as a noun:
1. a word introduced because an existing term has become inadequate; "Nobody ever heard of analog clocks until digital clocks became common, so `analog clock' is a retronym"