Attention Deficit Disorder: The same as ADHD (Attention Deficit Hyperactive Disorder), but without the Hyperactive personality. (see below)
Attention Deficit Hyperactivity Disorder: Usually in children, as when the child grows up they can grow out of it (or grow into it and gain the ability to control themselves-however this isn’t the case for all and there are exceptions) The characteristics are lack of attention (or short attention span), hyperactive and impulsiveness.