Trills are musical ornaments that are produced by rapidly alternating between two adjacent notes. There are a number of different synonyms that can be used to describe this particular type of musical embellishment. Some of the most commonly used synonyms include warbles, shakes, quavers, vibratos, and tremolos. Depending on the specific type of music being played, different synonyms may be more appropriate than others. For instance, warbles might be most commonly associated with traditional folk music, while shakes are often used in more modern genres such as pop and rock. Ultimately, the choice of synonym will depend on the specific context in which the trill is being used.