The word "tatas" is often used as a slang for breasts. However, there are several synonyms that can be used instead of "tatas". Some common synonyms include "boobs", "bust", "chest", and "mammary glands". Other more playful synonyms include "melons", "jugs", "knockers", "titties", and "fun bags". It is important to remember that using slang or derogatory terms to refer to a woman's body is disrespectful and objectifying. It is always best to use respectful language when talking about someone's body.