Respectable rhymes with:
collectible, delectable, detectable, electable, injectable, uncollectable, undetectable, unelectable, collectible, deductible, delectable, destructable, detectable, electable, ineluctible, injectable, intractable, predictable, retractable, tractable, tractebel, uncollectable, undetectable, unelectable, unpredictable
Respectable sounds like:
respectably, respectful, respectfully, respectively