Key ring and Keychain

Key ring noun - A circular ring of metal for holding keys.

Keychain and key ring are semantically related in charm topic. In some cases you can use "Keychain" instead a noun phrase "Key ring", when it comes to topics like pendant.

Key ring and keychain are semantically related in charm topic. You can use "Key ring" instead a noun "Keychain", if it concerns topics such as pendant.