Ex and One-time

Ex adjective - Out of fashion.

One-time and ex are semantically related. in former topic. In some cases you can use "One-time" instead an adjective "Ex", when it comes to topics like olden, previous in time or order.

One-time adjective - Belonging to some prior time.

Ex and one-time are semantically related. You can use "Ex" instead an adjective phrase "One-time".