Clops refer to the sound made by the hooves of a horse while walking on a hard surface. There are various synonyms for the word "clops," including "clip-clops," "clop-clops," "clomp," "clatter," "tramp," "stomp," "gallop," "trot," and "canter." These synonyms are used to describe the sound of horse hooves in different contexts. "Clip-clops" and "clop-clops" always refer to the sound of horse hooves on concrete or hard pavement, while "tramp" and "stomp" can be used to describe the sound of any heavy footsteps. "Clatter" and "gallop" are generally used to describe a faster pace, while "trot" and "canter" are used to describe a slower pace.