I think you might be a little confused. You probably meant "fast" and its synonyms.
The word "fast" in English can have multiple meanings. As an adjective, it can mean "moving or capable of moving at high speed" or "happening in a short time".
Synonyms for the "quick - moving" meaning:
- Quick:
- Meaning: It means done with speed, or able to move fast. For example, "He gave a quick glance at his watch." It emphasizes the speed of an action and is often used to describe something that is done promptly or in a short time.
- Similarity to "fast": Both "fast" and "quick" convey the idea of speed. They can be used to describe things like movements or processes that happen rapidly. For example, a "fast runner" and a "quick runner" both imply someone who can cover a distance in a short amount of time.
- Difference: "Quick" can sometimes imply a sense of alacrity or promptness more than just pure speed. For instance, "a quick decision" might focus on the fact that the decision was made without hesitation, while "a fast decision" might focus more on the speed at which it was made without considering the thought process behind it.
- Rapid:
- Meaning: It means happening in a short time or at a great rate. For example, "The car was traveling at a rapid speed." It is often used to describe things that are happening very quickly and continuously.
- Similarity to "fast": It is very similar to "fast" in that it also refers to high speed. A "rapid river" and a "fast river" both suggest a river that is flowing quickly.
- Difference: "Rapid" can sometimes have a more formal or technical connotation. It's often used in more scientific or technical contexts, such as "rapid growth" in a biological context, where "fast" might sound a bit more casual.
- Swift:
- Meaning: It means moving or able to move very quickly. For example, "The swift bird flew across the sky." It often implies a smooth and efficient kind of speed.
- Similarity to "fast": Like "fast", it describes speed. A "swift movement" and a "fast movement" both mean a movement that is done quickly.
- Difference: "Swift" can carry a sense of grace or elegance in movement. For example, a ballet dancer's movements might be described as "swift" to emphasize the beauty and fluidity of the motion, while "fast" might just refer to the sheer speed without the aesthetic aspect.
If "fast" is used as an adverb, meaning "quickly", the above - mentioned synonyms "quickly", "rapidly", and "swiftly" can also be used in a similar way. For example, "He ran fast" can also be written as "He ran quickly/rapidly/swiftly".