Trillo is a musical term used to describe a rapid alternation between two notes. However, there are many other synonyms for this term that can be used in different contexts. Some of the synonyms include "tremolo," "vibrato," "flutter," "quaver," and "shake." These terms are often used in music to describe the technique used by a musician to create a specific sound or effect. Additionally, the term "trill" can also be used as a synonym for trillo in some instances. It is important to use the correct synonym for the appropriate context, as these terms can have slightly different meanings and implications.