Aside from being an uglier word to say than look at, a synecdoche is a specific type of metonym where something is referred to by either a component of itself or, conversely, a broader category to which it belongs. When I call myself a writer, I’m naming one aspect of the process to say that I’m a storyteller.
- I need to find a way to put the slog in irons. [Referring to shackles by their material]
- Seeking to escape the slog, we entreated the Church to grant us asylum. [Referring to specific people by the organization they belong to, and that organization by the building it works in]
Synecdoche. Use it.