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