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A capacitor has no DC current path - it is open circuit to DC. An inductor provides a path to both AC and DC - it can only attenuate AC as part of a filter or potential divider. The inductor will have an impedance at a particular frequency but the amount it attenuated depends on the load impedance.
Keith
---------- Post added at 08:07 ---------- Previous post was at 07:53 ----------
I guess another way of comparing the behaviour of the capacitor and inductor is that zero frequency in a capacitor is like an infinite frequency to an inductor. In other words, you can block DC without a load with a capacitor and you could block AC with an inductor without a load, but only at infinite frequency (and infinite load). Zero frequency is practical (DC) but infinite frequency isn't so the comparison isn't all that useful.
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