I am looking for a synonym for the word application as in mobile application.
In Spanish I would use programa but I am not sure if English speakers would understand me if I use program to refer to an application.
Anybody technology-oriented would understand you. I use the words interchangeably all the time without any misunderstanding.
Some other words you might use are app, which has become very popular recently, and executable, though that might just refer to the main binary of the software.