Decaffeinating rhymes with:
hyphenating, alienating, assassinating, chlorinating, concatenating, contaminating, coordinating, culminating, detonating, discriminating, disseminating, dominating, eliminating, emanating, exterminating, fascinating, hydrogenating, hyphenating, illuminating, impersonating, incriminating, laminating, marinating, nominating, originating, predominating, procrastinating, rejuvenating, resonating, subordinating, terminating, urinating
Decaffeinating sounds like:
despondency, disappointing, disbanding