Here's what rhymes with decodable.
erodible Words that almost rhyme with decodable
notable potable quotable approachable irreproachable reproachable inapproachable unapproachable knowable sociable emotional devotional disposable negotiable notional revokable unknowable nonnegotiable unsociable renegotiable consolable promotional controllable inconsolable unemotional uncontrollable overemotional