Here's what rhymes with groupness.
Words that almost rhyme with groupness
rudeness crudeness lewdness cuteness acuteness shrewdness muteness astuteness hirsuteness absoluteness dissoluteness resoluteness irresoluteness lupus glumness ulnas units useless ruthless coolness eunuchs newness aloofness blueness roofless clueless lulus mucous mucus cubits humus smoothness toothless moonless rootless spruceness cutups chukkas tuneups houmous houmus fruitless nuisance prudence fluence hubris tulips congruous obtuseness bootless caduceus diffuseness humourless juleps mullets gullets glamourous foodstuffs mutants tumults avoirdupois scrofulous truants coolants duellists quadruplets abstruseness profuseness sublets bouffants students movements pollutants pursuance imprudence impudence exiguous annuitants canoeists intuits manumits amusements persecutions improvements inducements disputants translucence jurisprudence