"Our" and "are" are two different words entirely, and they can never be used interchangeably because they belong to different parts of speech. The only reason why the two words can be confused for each other is that they have similar sounds. One of the ways to differentiate between the two words is by looking at their meanings. ‘Our’ is an adjective that can be used to describe something that belongs to us.
Most times, the word 'our' is used before a person's name to show that such an individual is a member of one's family or a friend. For example, I am going to see John after the match. The word 'are,' on the other hand, is a verb which is used as a second-person singular simple present of 'be.'
For example, Chris, are you listening? It can be used as a first-person plural simple present of be. For example, we are going to react to the allegation at the right time. It can also be used as a second-person plural simple present of being, and as a third-person plural simple present of be.