2 syllables:
benel, chenal, chenille, crenel, crenelle, denel, fehnel, fenil, fennel, fennell, gentle, grenell, haenel, henle, jenell, kennel, kennell, penale, pennel, pennell, phenol, quennel, senal, senel, tennell, tennille, trennel, vennel, wennel, when'll, cental, dentale, dentil, dentile, ental, kentle, lentil, lentille, mental, mentale, pentyl, rental, sentell, trental, ventil, ventile, yentl

3 syllables:
antennal, dog fennel, enkennel, judgmental, propenal, propenyl, unkennel, again till, amental, argental, bidental, cemental, ectental, fermental, judgemental, momental, omental, parental, pigmental, pimental, placental, proventil, regental, segmental, simental, simmental, submental, tangental, tegmental, the rental, tormentil, ungentle

4 syllables:
accidental, common fennel, continental, departmental, detrimental, elemental, emerald fennell, experimental, florence fennel, fundamental, incremental, instrumental, monumental, occidental, oriental, sentimental, supplemental, transcendental, water fennel, alimental, apartmental, aplacental, argumental, atramental, biparental, circumlental, compartmental, complemental, complimental, condimental, decremental, documental, excremental, falcon-gentle, firmamental, flower-gentle, fondamentale, governmental, implacental, implemental, incendental, incidental, incindental, interdental, interdentil, isopentyl, linguadental, linguidental, managemental, nidamental, nonjudgmental, nonsegmental, nutrimental, occidentale, orientale, ornamental, paradental, parliamental, pedimental, peridental, recremental, regimental, retrolental, rudimental, sedimental, sentimentale, temperamental, tenemental, testamental, thiopental, trancscendental, transplacental, transsegmental, tunnelmental

5 syllables:
developmental, environmental, transcontinental, coincidental, dissepimental, emolumental, equimomental, fetoplacental, impedimental, inalimental, integumental, intersegmental, labiodental, labiomental, lineamental, maxillodental, non-governmental, nongovernmental, pancontinental, presentimental, subcontinental, suprasegmental, uniparental, unornamental, unsentimental

6 syllables:
o. t. fagbenle, sympathoadrenal, alveolodental, epicontinental, intercontinental, interdepartmental, intergovernmental, intradepartmental, occipitomental, uteroplacental

7 syllables:
bioenvironmental

2 syllables:
hemal, temple, mendel, bengal, kendall, tremble, haemal

3 syllables:
provencal, resemble, assemble, dissemble

4 syllables:
disassemble, reassemble, bay of bengal, gregor mendel, preassemble

6 syllables:
gregor johann mendel