Speed and Swiftness:
* Fast: The most direct synonym, emphasizing rapid motion.
* Rapid: Implies a high rate of speed, often used for movements or changes.
* Swift: Suggests effortless and graceful speed.
* Speedy: Similar to fast, but often used in a more informal context.
* Hasty: Implies speed done without careful thought.
* Fleet: Means moving very fast, especially in reference to animals.
* Nimble: Describes quick and agile movements.
* Agile: Similar to nimble, but emphasizing flexibility and adaptability.
Timeliness:
* Prompt: Means done or happening at the right time, without delay.
* Expeditious: Implies efficiency and speed in completing a task.
* Timely: Happening or done at the appropriate time.
* Sudden: Happening unexpectedly and quickly.
Other Related Words:
* Brief: Used for something that lasts a short time.
* Short: Similar to brief, but can also refer to distance.
* Sharp: Can be used to describe something that is quick and precise.
The best word to use depends on the context and the specific nuance you want to convey.