The word itself? There's little practical difference.
The concept, though, it's a very wide moat. You could call a unicorn "nyati" for all we care, we still know it's the concept of a magical flying horse with a single horn. We know, besides the literary corpus, the concepts of magic, horse, flying, and horns. It's fictional, yet we have a very good idea of what if would sound, feel, or even smell like. Ask an LLM to describe what a unicorn feels like, and it will ramble about forests and sparkles.
In fact, I asked Gemini (thinking, to see the process) to describe a mindful experience about meeting an unicorn in real life, and it did ramble about the event. When I reminded it about mindfulness being about experiencing with all your senses, and asked it to focus on the creature, to its credit, it even described the taste:
> Taste: Even the air surrounding the creature tastes different on your tongue—thin, crisp, and tinged with a faint, sweet metallic tang, like snow melting on limestone or fresh rain falling through high canopy.
Still nonsense, as a unicorn (or the air around it) will likely taste like horse, whatever that flavor is. It finishes with more nonsense, and I doubt the flash version will give better results.
> Every micro-detail of its anatomy becomes an anchor to the present moment. You are not thinking about what it means or where it came from; you are simply perceiving the texture, heat, sound, and weight of a living, breathing reality standing inches away.
Still, current LLMs can do amazing things given their inherent limitations, and that makes it easy for us to overestimate their capabilities.