The phrase "rush hour" is commonly used to describe the busiest time of day on a city's roads or public transport systems. However, there are many synonyms for this phrase that can be used to add variety to your language. These include peak hour, commuter time, busy period, traffic jam, gridlock, and the crush. Each of these phrases can be used to describe the hectic and congested streets that people face during their daily commute. By using different synonyms for "rush hour," you can avoid repetition in your writing and add interest to your language.