"Onscreen" is a term used to describe something that is visible or displayed on a digital device, such as a computer or a mobile phone. However, there are various synonyms that can be used in place of "onscreen" depending on the context or situation. Some of the common synonyms include visible, displayed, presented, projected, exhibited, shown, and viewed. These synonyms help in creating variety in writing and avoid repetition. For instance, instead of saying "the message appeared onscreen," one can use "the message was displayed on the screen." In this way, using synonyms can enhance the overall quality of written content.