rallying cry vs watchword

rallying cry and watchword both are nouns.

Word	Noun	Adjective	Verb	Adverb
rallying cry	Yes	No	No	No
watchword	Yes	No	No	No

As nouns, rallying cry and watchword are synonyms defined as:

Other synonyms of rallying cry include battle cry, cry, war cry.

rallying cry (noun)	watchword (noun)
a slogan used to rally support for a cause	a secret word or phrase known only to a restricted group
a yell intended to rally a group of soldiers in battle	a slogan used to rally support for a cause