Q. I am writing a book on a movement practice called Authentic Movement that distinguishes those in the role of movers and those in the role of witnesses. Should the words Mover and Witness be capitalized since they have a specialized meaning in this context? And if so, should they be capitalized in just the first usage, or throughout the entire book?

A. Chicago style lowercases words like these. If your goal is to promote Authentic Movement into franchises or some other commercial use, then caps might be appropriate. But in normal contexts, even if these words denote practitioners of Authentic Movement, they are still common nouns (not proper nouns) with no need for capitalization.