Here's what rhymes with rainbowcolored.
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covered cultured cupboard suffered governed muttered hovered shuddered buffered cluttered buttered custard puckered shuttered buzzard hungered cumbered mothered discovered recovered wondered numbered uncovered clustered mustard mustered ruptured sculptured fluttered smothered thundered sputtered lumbered stuttered sundered uncultured dissevered hunkered poniard sluggard plundered drunkard encumbered punctured undiscovered blundered flustered unnumbered untutored slumbered sunburned uncluttered blustered spluttered ungoverned structured outnumbered rediscovered unencumbered renumbered unstructured restructured