Byword and Watchword

Byword noun - An often stated observation regarding something from common experience.

Watchword and byword are semantically related in slogan topic. In some cases you can use "Watchword" instead a noun "Byword".

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

Byword and watchword are semantically related in guiding principle topic. You can use "Byword" instead a noun "Watchword".