Whippoorwills rhymes with:
advil's, anthills, bonnevilles, carville's, catskills, cranesbills, crossbills, daffodils, emuil's, foothills, freshkills, handbills, hawkbill's, hornbills, jacksonville's, landfills, morrisville's, nashville's, rototilles, sawmills, treadmills, windmills