The phrase "loud reports" can be replaced with several synonyms, including "sharp detonations," "explosive booms," "thunderous blasts," "ear-splitting bangs," and "deafening claps." Each of these phrases describes a loud, sudden noise that may be startling or frightening to hear. Depending on the context, one phrase may be more appropriate than another. For example, "thunderous blasts" could describe a military bombardment, while "sharp detonations" might describe fireworks. Choosing the right synonym can help add nuance and precision to one's writing, ensuring that readers understand exactly what kind of noise is being described.