Intergovernmental rhymes with:
nongovernmental, nongovernmental, nongovernmental, nongovernmental, environmental, nongovernmental, compartmental, detrimental, developmental, elemental, environmental, experimental, fundamental, incremental, instrumental, judgemental, judgmental, mental, monumental, nongovernmental, ornamental, pimental, regimental, sentimental, simental, supplemental, temperamental, unsentimental