Able and capable are both used to say that someone can do something.
If someone is able to do something, they can do it either because of their knowledge or skill, or because it is possible.
If you use a past tense, you mean that someone has actually done something.
If someone is capable of doing something, they have the knowledge and skill to do it.
You can say that someone is capable of a particular feeling or action.
You can also use capable of when you are talking about what something such as a car or machine can do.
If you describe someone as able or capable, you mean that they do things well.
| Adj. | 1. | able - (usually followed by `to') having the necessary means or skill or know-how or authority to do something; "able to swim"; "she was able to program her computer"; "we were at last able to buy a car"; "able to get a grant for the project"unable - (usually followed by `to') not having the necessary means or skill or know-how; "unable to get to town without a car"; "unable to obtain funds" |
| 2. | able - have the skills and qualifications to do things well; "able teachers"; "a capable administrator"; "children as young as 14 can be extremely capable and dependable"competent - properly or sufficiently qualified or capable or efficient; "a competent typist" | |
| 3. | able - having inherent physical or mental ability or capacity; "able to learn"; "human beings are able to walk on two feet"; "Superman is able to leap tall buildings"capable - (usually followed by `of') having capacity or ability; "capable of winning"; "capable of hard work"; "capable of walking on two feet" | |
| 4. | able - having a strong healthy body; "an able seaman"; "every able-bodied young man served in the army"fit - physically and mentally sound or healthy; "felt relaxed and fit after their holiday"; "keeps fit with diet and exercise" |