Sheathbills rhymes with:
brazzaville's, brooksville's, churchill's, colleville's, cromwell's, dansville's, farrell's, fibriles, granville's, manville's, monfils, nevills, pannill's, pendril's, penn-hills, personals, powell's, rachels, tocqueville's
Sheathbills sounds like:
stabilize, stabilizes, stables, staphylococcus, staples, stathopoulos, steeplechase, steeples, stifles, stoffels