Neither are covered under comprehensive.
Uninsured motorist coverage provides coverage if you're involved witn an "Uninsured Motorist" In such a case you can claim for Bodily Inury, Death and Property Damage (This covers your car, it's contents and their loss of use).
If you are involved in an an incident with an unidentified automobile you can only claim bodily injury or death.
An uninsured automobile is one where neither the owner of the car, or the operator have a liability insurance policy which covers the car. An unidentified automobile is one that is completely unindientified, i.e. a hit and run vehicle.
The max you can claim, in Ontario, is $200 000, which includes a maximum of $25000 for property damage. Claims are also subject to a $300 deductible.