Hyponex rhymes with:
annex, bottlenecks, crownx, fanech's, finex, methanex, nynex, rednecks, roughnecks, turtlenecks
Hyponex sounds like:
haifong, happening, happenings, happens, happiness, havana's, havens, having, havins, heaping, heaven's, heavens, heaving, hibbing, hipbones, hobbing, hobbins, hoffman's, hoping, hopping, hovanec, hovhaness, hoving, huffines, huffing, hyping, hypnosis