Monorails rhymes with:
airedales, bloomingdale's, bloomingdales, clinkscales, coattails, cocktails, conrail's, dovetails, fairytales, female's, females, fingernails, guardrails, handrails, hemdale's, horsetails, lawnsdale's, mondale's, palmdale's, resales, retails, stockdale's, telltales, toenails, wholesales
Monorails sounds like:
marlys, maryalice, memorialize, memorials, merlis, merrill's, mineral's, mineralize, mineralogy, minerals, minerals', mireles, mirelez, morales, moralez, moralize, morals, morelock, morlock, murals