The concept of time has many synonyms that are often used interchangeably. These include words such as duration, period, span, moment, and interval. Each of these words refers to a specific amount of time, with duration emphasizing the amount of time something lasts, period referring to a specific point in time, span indicating the length of time between two points, and moment emphasizing a very short period of time. Interval is used to describe the time between events or activities. While these words are similar in meaning, each one has a unique nuance that makes it appropriate for specific contexts, helping writers and speakers to better express themselves.