I don't see any value, but hopefully somebody on here can correct me !
The problem is the automated valuation tool lacks the human insight into the practical uses of this name. The extension is the issue.
Diccionario.es absolutely, but why would you have it with a .co.uk extension ?
SpanishDictionary (.co.uk) is much better.
If it's for an english speaker wanting to learn spanish I'm still not sure it's the best name. It's so easy to mis-spell.
But perhaps I'm wrong, and I've opened up a debate !
Good luck.
Steve.