Decades rhymes with:
arcades, blockades, brocades, cascade's, cascades, cascades', kincaid's, ades, aid's, aide's, aides, aides', aids, arcades, blades, blaydes, blockades, braids, brigades, brocades, cascade's, cascades, cascades', charades, conrades, crusades, degrades, downgrades, evades, fades, fayed's, glades, grades, grenades, invades, jades, kincaid's, maid's, maids, maids', mcdade's, palisades, parades, persuades, pervades, promenades, raids, shades, spades, suedes, tirades, trade's, trades, upgrades, wade's, wades
Decades sounds like:
dakota's, dakotas, dataquest's, de-excites, decade's, deceits, decides, deciduous, decodes, dedicates, deducts, descoteaux, desiccates, destec, detects, diastase, dicots, dictates, didactic, digest's, digests, digitech, digitize, digits, dioxides, discotheque, discotheques, disgusts, diskettes, dissects, distasi, distasio, dockets, dogwoods, ducts, dugouts, dusts, dziedzic