Here's what rhymes with extensiveness.
expensiveness pensiveness defensiveness offensiveness intensiveness inexpensiveness inoffensiveness apprehensiveness comprehensiveness Words that almost rhyme with extensiveness
tenseness denseness attentiveness expressiveness inventiveness possessiveness oppressiveness restiveness inattentiveness retentiveness obsessiveness scarceness festiveness effectiveness aggressiveness penitence impressiveness suggestiveness defectiveness perceptiveness contentedness deceptiveness objectiveness repressiveness connectedness ineffectiveness progressiveness protectiveness receptiveness unexpectedness caribous residence reticence headmistress celibates hesitance residents collectivists disconnectedness fetishists embellishments counterintelligence