Goniometer rhymes with:
accelerometer, anemometer, densitometer, dynamometer, fluorometer, hydrometer, hygrometer, interferometer, kilometer, magnetometer, micrometer, odometer, spectrometer, speedometer, thermometer
Goniometer sounds like:
gandara, gander, ganter, gantry, gender, gendreau, genter, genther, gentry, geometry, ginder, ginter, ginther, gonder, guenter, guenther, guinther, gunder, gundry, gunter, gunther, guntur