Is Overactivity One Word?

adj. Active to an excessive or abnormal degree: an overactive pituitary gland; an overactive imagination. o′ver·ac·tiv′i·ty n.

Is hyperactive one word or two?

Hyper comes from a Greek word for “too much.” If someone is hyperactive, she might have attention deficit hyperactivity disorder (ADHD). People who suffer from it are hyperactive and can't concentrate. You could say they're hyper, which is short for hyperactive, but that's not very polite.

What do overactive mean?

: excessively or abnormally active overactive glands an overactive imagination.