Hydraulics rhymes with:
wallich's, acrylics, alcoholics, alix, calix, calyx, catholics, cowlicks, ehrlich's, felix, fralix, gunlicks, helix, interpublic's, italics, metallic's, non-catholics, public's, publics, publix, relics, republic's, republics, symbolics, wallich's, workaholics
Hydraulics sounds like:
hydraulic, hydrolysis, hydrolyze