battle cry vs watchword

battle cry and watchword both are nouns.

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

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

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

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