What did you read the title of this post as? A noun, or a verb?
I've written both the plural form of the noun analysis and the 3rd person singular form of the verb analyse squillions of times, and only last week did I realise they are spelt exactly the same way.
Call me a doofus, if you like, but it's true. In my mind they are two totally distinct lexical items, though obviously related, and I knew how to spell both. Because they can never be confused in context, I've never once thought one when I meant the other, and so never noticed the spelling was the same. Just shows, there is no ambiguity in the language of thought.