The phrase "art an adjunct of" implies a relationship between art and something else, that art is secondary or subservient in some way. Some synonyms for this phrase might include "art as a tool for", "art subservient to", "art in service of", or "art as a means to an end". Each of these phrases highlights a different aspect of the relationship between art and its perceived purpose. Whether it is to serve a greater goal, a specific agenda, or a particular vision, these phrases all convey a sense of art being used for a specific purpose beyond its intrinsic value as a form of expression.