However, depending on the context, you could use some related nouns that give a more concrete sense:
* Skill: This implies a learned ability, like "He has the skill to play the piano."
* Talent: This implies a natural ability, like "She has the talent for drawing."
* Strength: This implies physical power, like "He has the strength to lift that heavy box."
* Knowledge: This implies understanding and information, like "He has the knowledge to solve this problem."
* Potential: This suggests an ability that hasn't been fully realized yet, like "She has the potential to become a great writer."
Ultimately, the best concrete noun will depend on the specific meaning you want to convey.