Impeachable rhymes with:
unimpeachable, unimpeachable, unimpeachable, reachable, teachable, unimpeachable, unreachable, approachable, detachable, reachable, teachable, touchable, unimpeachable, unreachable, untouchable
Impeachable sounds like:
impassable, impassively, impeccable, impeccably, impossible, impossibly, infeasible, invisible