The terms "able" and "capable" are often used interchangeably, but there are some subtle differences between them. "Able" typically implies a natural or inherent ability or talent to do something. For example, someone might be said to be "able to play the piano" if they have a natural musical ability. On the other hand, "capable" usually refers to having the necessary skills or qualifications to do something. For example, a person might be considered "capable of doing a job" if they have the relevant training and experience.
Another difference between the two terms is that "able" often implies a sense of potential or possibility, while "capable" implies a sense of actuality or achievement. For example, someone might say that they are "able to learn a new language" if they believe they have the potential to do so, but they may not yet have the skills or knowledge to do so. In contrast, someone might say that they are "capable of speaking a foreign language" if they have already learned it and are able to use it effectively.
Overall, while the terms "able" and "capable" are similar in meaning, they do have some distinct differences in connotation and usage. Understanding these differences can help you use the terms more accurately and effectively in your writing and communication.