Common words:
* able
* unable
* disabled
* enable
* disable
* capable
* incapable
* habitually (from "habitable")
Less common words:
* liable
* improbable
* incredible
* comfortable
* invaluable
Note: Some of these words use the root "able" in a slightly modified way. For example, "comfortable" is derived from "comfort" but retains the "able" ending to indicate a state or ability.