Signal and Watchword

Signal noun - An object intended to give public notice or warning.

Watchword and signal are semantically related in password topic. In some cases you can use "Watchword" instead a noun "Signal".

Nearby Words: signaled, signalize, signally, signalling, signaling

Watchword noun - A word or phrase that must be spoken by a person in order to pass a guard.

Signal and watchword are semantically related in motto topic. You can use "Signal" instead a noun "Watchword", if it concerns topics such as password.