Here's what rhymes with sootcoloured.
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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 plundered ruptured sculptured drunkard fluttered smothered thundered blundered sputtered lumbered stuttered sundered uncultured blustered dissevered hunkered poniard sluggard spluttered structured outnumbered encumbered punctured flustered unnumbered untutored slumbered sunburned uncluttered ungoverned rediscovered undiscovered renumbered unstructured restructured unencumbered