Here's what rhymes with existential.
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gentle dental mental temple parental rental lentil incidental tremble semble accidental assemble oriental placental coincidental exemple judgmental occidental dissemble judgemental fundamental governmental instrumental resemble elemental sentimental regimental supplemental disassemble excremental experimental developmental continental detrimental incremental ornamental reassemble environmental monumental transcendental temperamental nonjudgmental unsentimental compartmental intergovernmental nongovernmental subcontinental intercontinental transcontinental pencil tensile bestial special essential devil sterile peril pedal bevel pebble betel kennel pestle petal venial beryl fennel peddle speckle cecal bezel level several central potential careful metal vessel differential settle celestial dreadful rebel spectral especial methyl ventral kettle medal stressful eventful inferential meddle mesial revel treble vengeful wrestle faecal feral fretful imperil mettle nettle prayerful sessile trestle nestle utensil fettle freckle mescal shekel suspenseful treadle embezzle heckle pretzel chestful helpful confidential respectful healthful rectal septal acetyl dimethyl resentful restful festal distressful prehensile bedevil bipedal vestal shovelful zestful headstall dishevel successful epithelial experiential forgetful erectile palpebral quintessential revengeful regretful resettle traversal unsettle teakettle overcareful ancestral departmental endothelial orchestral projectile disrespectful uneventful neglectful pubertal tocopherol unhelpful dialectal primaeval unhealthful gunmetal nonmetal cockleshell unsuccessful colorectal multilevel nonresidential quadrupedal interdepartmental nondepartmental