Ability is a noun. Its verb form is Enable, which means to make something possible or to give someone the means to do something.

১. Ableness is a noun form, though much less common than ability.
২. Ably is an adverb, describing how an action is performed with skill.
৩. Able is an adjective, used to describe a person who has the power or skill to do something.

অতিরিক্ত তথ্য: Adding the prefix "en-" to adjectives often creates a verb, like "large" to "enlarge".