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Confidence votes 317. Inertia is rotary momentum; an object's ability to continue spinning when a decelerating force is applied. Just as a heavy object takes more effort to stop from the same speed as a light object, so does a heavy object take more effort to stop from turning at the same speed as a light object. So assuming they are turning at the same angular velocity, the heavier one has a larger inertia.
(i think it may also be used for objects out of water, but i don't know about that). objects with heavier density sink because the force exerted downward by the dense object (due to gravity, i think) is greater than the upthrust. less dense objects float because the upthrust is greater than the force exerted by the mass of the less dense object. i know im not very clear, but that's what i know about upthrust.