3 syllables:
amaris, amorous, clamorous, clamourous, gammarus, glamorous, glamourous

4 syllables:
decamerous, heptamerous, pentamerous, tetramerous, unglamorous, unglamourous

5 syllables:
monoamorous, polyamorous

3 syllables:
emphasis, nebulous, elements, hephaestus, tetanus, sedulous, petulance, offenseless, fecklessness, membranous, restlessness, excellence, exodus, evidence, pendulous, recklessness, edifice, detritus, blessedness, helplessness, renascence, precedence, helpfulness, pestilence, tremulous, prevalence, eminence, tenebrous, fretfulness, aesculus, pegasus, endlessness, resinous, credulous, resonance, dreadfulness, elephants, eloquence, pleasantness, regulus, daedalus, gentleness, healthfulness, precipice, petalous, specialness, negligence, tendinous, tenuous, emulous, femaleness, genesis, xenopus, venomous, benelux, elegance, relevance, acarus, anurous, apterous, avarice, cambarus, cancerous, cankerous, canorous, clangorous, grandparents, languorous, lasiurus, lazarus, rancorous, rapturous, slanderous, valorous

4 syllables:
contentiousness, benevolence, inelegance, antecedence, preeminence, beneficence, unpleasantness, affectedness, apetalous, directionless, edematous, shigellosis, state's evidence, maleficence, pink elephants, persepolis, incredulous, irrelevance, intelligence, malevolence, eleven-plus, necessitous, cadaverous, cantankerous, cape hatteras, decapterus, ictalurus

5 syllables:
macrocephalous, leptocephalus, atelectasis, conscientiousness, hearsay evidence, hydrocephalus, direct evidence, microcephalous, overemphasis

6 syllables:
magnetic resonance, indirect evidence, dicotyledonous

7 syllables:
circumstantial evidence

8 syllables:
artificial intelligence