Mantra and Watchword

Mantra noun - (Sanskrit) literally a `sacred utterance' in Vedism; one of a collection of orally transmitted poetic hymns.

Watchword and mantra are semantically related In some cases you can use "Watchword" instead a noun "Mantra".

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

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