Hourglass rhymes with:
fiberglas, fiberglass, eyeglass, fiberglas, fiberglass, plexiglas, plexiglass, spyglass, sunglass, eyeglass, fiberglas, fiberglass, outclass, plexiglas, plexiglass, spyglass, sunglass, underclass, upperclass
Hourglass sounds like:
harkless, hercules, herschel's, hourglasses