retronym
/ˈrɛtroʊnɪm/
noun
- A new name for something that already exists, created because the original name is no longer specific enough after a newer version or invention appears.
- The term "landline phone" is a retronym that distinguishes old wired phones from cell phones.
- "Acoustic guitar" is a retronym created after electric guitars became popular.
- Many people now say "manual transmission" as a retronym to contrast with automatic cars.