hub
Community activity center.
activity
activity
Busywork.
Middle.
A flurry of activity
center of attention
It is the lungs.
Hibernation does not have a direct a antonym, but the word activity is close. Another related word is functioning / functional.
Vigorus workout?
A detective or investigator is another word for a person employed to find out information and examine any unlawful activity.
Another 5 letter word for shopping centre is "shops" "malls"