Volubility
Part of speech: noun
Definition: the state of being voluble the degree to which someone is voluble
Fluency
Part of speech: noun
Definition: The quality of smoothness of flowThe quality of being fluent in a language; A person's command of a particular language.
Example sentence: There is a fluency and an ease with which true mastery and expertise always expresses itself, whether it be in writing, whether it be in a mathematical proof, whether it be in a dance that you see on stage, really in every domain. But I think the question is, you know, where does that fluency and mastery come from?