Is the word teased a synonym?

"Teased" is not a synonym itself. It's a verb, meaning to make fun of someone in a playful or unkind way.

To be a synonym, it needs to be paired with another word. For example:

* Teased is a synonym for mocked

* Teased is a synonym for jeered

* Teased is a synonym for ridiculed

So, while "teased" isn't a synonym on its own, it can be used as one when referring to the act of making fun of someone.