The word is often used to refer to something at a high level that is distinct from the lower-level details, whereas design more often refers to structures and decisions at a lower level. But the two are intrinsically linked, and we cannot have a good product without synergy between the two. The low-level details and high-level structure are all part of the same whole. They form a continuous fabric that defines the shape of the system. You can't have one without the other; there is a continuum of decisions from the highest to the lowest levels.

Working separately on architecture and design, without a central theme and principles guiding both, leads to developers perceiving the code base in the same way that the blind men perceived the elephant in the famous parable.

On the other hand, it is not practical (or desirable) for the architect to document every aspect of low-level design. The key is to build a vision and guiding principles for the code, which can be used as guard rails by the developers when making decisions at each level.