"Mwah" is typically used as a sound effect to represent a kiss or an air kiss. However, there are a few other synonyms that can be used in its place. Some alternatives include "muah," "xoxo," "smooch," "peck," "love kiss," and "blow a kiss." Each of these words conveys a similar sentiment and can be used in a variety of contexts, such as affectionate messages or to express fondness towards someone. Regardless of which word one chooses to use, they all serve as a sweet and endearing way to show someone that they are loved and appreciated.