There are many synonyms for the word "slates". Some common synonyms include roof tiles, shingles, plates, planks, slabs, and panels. These words can be used interchangeably depending on the context, such as when referring to roofing materials or writing surfaces. Other synonyms for "slates" may include flat stones, flagstones, or paving stones. These words are often used in the context of outdoor or landscaping projects. Whether one is referring to roofing, writing surfaces, or outdoor applications, there are many useful synonyms for the word "slates".