From what direction was the car bumped? If it was from the front driver's side, it could be you have a motor mount whose rubber isolator ripped, or maybe the battery tray (they are mostly plastic) got cracked and is letting the battery rub something.
You could have a close look at that corner of the engine compartment, to see if anything is now touching that should not be. You might have to remove the air filter housing, the rubber inlet duct, & battery/battery tray to see it. (Just becasue they cover up a lot of territory) And looking from underneath, check that the rubber isolators are still between that front-to-rear crossmember under the transmission. The isolators in the rear get a lot of oil from normal old age leaks. If they got knocked out, you might hear a good bit more engine noise coming into the car.
On the other side of the motor, at the front, is the accessory bracket that holds the alternator, power steering pump, & a.c. compressor. If the bump was from the front or on that side (passenger side) Maybe something is now touching that bracket. (if the radiator got bumped out of place), or the plastic radiator fan shroud is touching the exhaust manifold. Make sure there is nothing rubbing against the serpentine belt (on the passenger side of the motor). On mine this belt can only be seen by looking down from above, AND up from below. And its possible your car still has its splash shield under the front of the motor - which gets in the way of inspectiing things down there.
And a bump can cause a crack in the exhaust system - that would result in strange noises.
