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