The word "titterer" is commonly defined as a person who giggles or laughs softly and nervously, often in an uncontrolled manner. However, there are many synonyms that can be used to describe this type of behavior. Some examples include chortler, snickerer, chuckler, giggler, and sniggerer. Each of these words evokes a slightly different type of laughter or nervousness. For example, a chortler is someone who laughs with great enthusiasm and gusto, while a sniggerer is a person who stifles their laughter or sneaks in a quick chuckle. By using synonyms, writers and speakers can add nuance and variety to their language, making their communication more interesting and engaging.