vacillation vs indecisiveness

vacillation and indecisiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacillation	Yes	No	No	No
indecisiveness	Yes	No	No	No

As nouns, indecisiveness is a hypernym of vacillation; that is, indecisiveness is a word with a broader meaning than vacillation:

vacillation: indecision in speech or action
indecisiveness: doubt concerning two or more possible alternatives or courses of action

Other hypernyms of vacillation include indecision, irresolution.

vacillation (noun)	indecisiveness (noun)
changing location by moving back and forth	the trait of irresolution; a lack of firmness of character or purpose
indecision in speech or action	doubt concerning two or more possible alternatives or courses of action