our

We don’t traditionally think of our as having synonyms, but there are several situations in which it can replace—or be replaced with—another term.

our own 

The phrase our own is sometimes used as a more emphatic way of saying our, as in I can’t believe we were betrayed by our own family members.

ours

Sometimes you can reword what you’re saying to use ours instead of our. For example, instead of saying This is our popcorn, you could say This popcorn is ours. 

us

Sometimes, us is used where the word our could also be used, such as in sentences like this: Did you hear about us getting lost? Historically, it was considered more proper to use our before gerunds (e.g., getting in the preceding example), but using us is now more common and often sounds more natural.

other possessives

Instead of saying things like This is my house and her house, we usually use the plural form our, as in This is our house. Sometimes, though, it makes more sense to separate who owns what by using separate possessive words. For example, instead of saying These are our vehicles, you could say This is my car and this is her truck.