The term 'Rush Hour Phenomenon' refers to the traffic congestion that occurs during peak hours of the day. This is usually caused by a combination of factors such as increased demand for transportation, limited road capacity, and poor traffic management. Two words that are commonly used to describe this phenomenon are 'JAM' (3 letters) and 'SNARL' (5 letters). A JAM is a situation in which vehicles are unable to move due to overcrowding, while a SNARL is a situation in which traffic is blocked or slowed down due to an obstruction. Both of these terms are used to describe the rush hour phenomenon, which can cause significant delays and frustration for commuters.