I know that equestrian is not the same as estuary but toss ups happen. It is one of those things that you take seriously until you realise how ridiculously irrelevant it is!

I picked the wrong word.

I also called the fish tank an aquarium this morning.

And it is just so. When you become confident enough to write an essay of 1500 words comparing Wordsworth and Blake you MUST embarass yourself just so that your ego does not reach the size of an elephant!