What is the synonym for was?

There isn't one single perfect synonym for "was" because its meaning can vary depending on the context. Here are some alternatives, each with a slightly different nuance:

For indicating past state or condition:

* Were (plural)

* Existed (more formal)

* Became (implies change)

* Had been (emphasizes duration)

* Used to be (indicates a past state that no longer exists)

For indicating past action:

* Did (more general)

* Accomplished (more formal)

* Performed (more formal)

* Completed (implies finishing)

* Achieved (implies success)

For indicating past events:

* Occurred (more formal)

* Took place (more formal)

* Happened (more casual)

The best synonym for "was" will depend on the specific situation and what you want to emphasize.