I think, though, with the spoken word, a word can sound different to how it is written. In conversation, we tend to speak more quickly, so that it seems as if some words have been shortened or blended into each other. There are, too, regional differences for the pronunciation of words so that, for example “our” can indeed sound like “are” when someone is saying something during a conversation. Now reading out loud, I think most people would read and say the words as they are spelt, with an accent perhaps, but not as different words.
Spelling is another matter of course, and writing “are house” rather than “our house” would be incorrect.
