Is 'inability' the same as 'disability'? According to the dictionary, they seem to be a little different in use. What about that?

Answer 1

They are similar in a way, but not in all ways.

https://www.onelook.com/?w=inability&ls=a&loc=home_ac_inability

and

https://www.onelook.com/?w=disability&ls=a&loc=home_ac_disability

Do you see the difference?

Answer 2

They are close -- but not exact.

Inability means a person either morally or physically can't do something. His inability to read directions was blamed on carelessness. His inability to swim the length of the pool was because of his weakness.

Disability implies the person is physically unable to complete a task. His inability to walk was because of his physical disability. The student's disability to learn placed him in a special education classroom.