Here's what rhymes with grous.
aureus ous prowess leprous Words that almost rhyme with grous
loudmouth allowance cloudless loudness brownness outface owlets doubtless countess groundless roundness bounteous foulness roundups countless boundless soundness groundnuts soundless stoutness thousandths devoutness accountants endowments unsoundness mountebanks profoundness viscountess announcements pronouncements denouncements