To understand what the score on an IQ test means, there are a few key terms that you should know: 1  Bell Curve: When IQ scores are plotted on a graph, they typically follow a bell-shaped curve. The peak of the bell occurs where the majority of the scores lie. 2  Mean: The average score.
Key difference: Disability is an injury that restricts the functions or movements of a person. Disorder is an illness that causes disruption to the functions of a person. Disability is the consequence of an impairment caused to a person. It is essentially a medical condition, which doesn't allow a person to function in a normal manner.
â¢ Disease also means a quality that is regarded as unfavourably affecting a person or a group of people. â¢ The word disorder is sometimes used in the sense of âa state of confusionâ. These are the differences between the two words, namely, disease and disorder.