Hi: besides there is a subtle difference which a well trained speaker can notice; generally speaking, in any language there often are some words which are written exactly the same -- just think to Chinese. So the context will help to understand the difference, because the wrong interpretation will sound "absurd". Write?

I understand

Right is the term used for something that is correct, as an affirmative term or combined with now it means that something is happening at that moment. Examples: - That is not right (that is not correct!). - I know right? - Get in here right now (come inside at this moment!). To write is a verb that means to write something, for example a letter or an essay. - I am writing a book. - She wrote an essay about World War I. - I write e-mails, not letters.