Apple address book is not responding -can i delete the application , and then reinstall it

on my imac apple address book is not responding -can i delete the application and then reinstall it - all contacts are backed up to icloud

If you have in mind backup, I would not count on iCloud backup, just go to ~/Library/Application Support/Address Book. In Lion, ~/Library is available by pressing Option key when selecting Go while in the finder. Backup that folder.
Deleting that app will create further troubles. When a basic Apple app bahaves like that, you should better identify why it behaves like that, it may mean a more serious system issue. Is this the only app, which presents this problem? If yes, rather delete its associated plist file in ~/Preferences (the same location, press Option when selecting Go).
Do regular backups of your data, choose a backup app you consider appropriate and proceed. When you are familiar with its reactions, you may then ‘play’ with deleting the partition and install/reinstall.

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