Thorntons sign, also known as the bronchial breath sound, is a term used in medical terminology to describe a particular respiratory feature. However, if you're looking for synonyms to diversify your vocabulary, you may consider using alternative expressions. Some of the synonyms for Thorntons sign could include "bronchial breath sound", "loud breathing", "audible resonance" or "bronchial tone". These phrases can be interchangeably used to describe the same medical condition. Nonetheless, it's essential to remember that accuracy and clarity in communication take precedence when conveying medical information.