2 syllables:
-itis, bitis, citas, citis, clitus, cytus, ditas, fleitas, gitis, ictis, litas, mitis, ritus, sitis, situs, smritis, tightass, titas, titis, titus, vitas, vitis, vitus, whitis

3 syllables:
actitis, arthritis, artritis, bolbitis, bronchitis, bulbitis, bursitis, caecitis, cecitis, cheilitis, chondritis, chorditis, cloacitis, cocytus, conchitis, corditis, corneitis, coxitis, cryptitis, cyclitis, cytitis, dartitis, delightous, dermitis, desmitis, discitis, diskitis, fascitis, faucitis, gastritis, glossitis, gonitis, ileitis, invite us, lienitis, lymphitis, mammitis, mastitis, mazaitis, mephitis, metritis, moraitis, myitis, nephritis, neuritis, nymphitis, ophritis, orchitis, osteitis, ostitis, otitis, petraitis, phallitis, phlebitis, phrenitis, phyllitis, posthitis, pouchitis, proctitis, pruritis, rachitis, rectitis, rhabditis, rhachitis, rhinitis, salitis, samitis, scleritis, scrotitis, sinuitis, steatitis, strumitis, struvite us, tarsitis, thecitis, tinnitis, trachitis, trichitis, typhlitis, unitas, uveitis, vagitus, villitis, vulvitis, zemaitis

4 syllables:
adenitis, adnexitis, aerotitis, anconitis, angiitis, aphroditus, arteritis, arvanitis, balanitis, barotitis, blepharitis, capsulitis, cephalitis, ceratitis, cerebritis, cervicitis, cholangeitis, cholangitis, choroiditis, clientitis, colonitis, coronitis, dactylitis, decubitis, decubitus, dermatitis, didymitis, diphtheritis, eburnitis, endangiitis, enronitis, enthesitis, ethmoiditis, expeditus, fasciitis, fibrositis, gangliitis, gaulanitis, gingivitis, glissonitis, gonarthritis, hepatitis, hepititus, heraclitus, hyalitis, hymenitis, iritis, jejunitis, keratitis, laringitis, laryngitis, limenitis, lithophytous, lymphangeitis, lymphangitis, mastoiditis, meibomitis, meningitis, meniscitis, mondayitis, mucositis, myelitis, myositis, myringitis, neuronitis, odontitis, omasitis, omentitis, omphalitis, onychitis, oophoritis, orchiditis, palatitis, panarthritis, panosteitis, panotitis, panuveitis, parotitis, petrositis, phalangitis, pharyngitis, placentitis, pleuritis, podarthritis, polyarthritis, polycleitus, polyclitus, propositus, pulmonitis, pyelitis, pyonephritis, salpingitis, sclerotitis, serositis, sigmoiditis, sinusitis, sodalitas, spondylitis, staphylitis, stomatitis, syndesmitis, synovitis, syringitis, tendonitis, tenonitis, tenontitis, tenositis, thyroiditis, tonsilitis, tracheitis, trachelitis, trachonitis, trigonitis, urarthritis, urethritis, uvulitis, vaginitis, zonulitis

5 syllables:
abomasitis, acroarthritis, acute gastritis, adenoiditis, adrenalitis, alveolitis, amnionitis, antiarthritis, arachnoiditis, arthrochondritis, blennadenitis, bronchiolitis, caenorhabditis, cholecystitis, chronic bronchitis, chronic gastritis, clitoriditis, conjunctivitis, costochondritis, cystourethritis, deferentitis, descemetitis, duodenitis, elephantitis, encephalitis, endaortitis, endocystitis, endometritis, endophlebitis, endophthalmitis, epaphroditus, ependymitis, episcleritis, epityphlitis, esophagitis, fibrochondritis, folliculitis, funiculitis, gastradenitis, gastrocolitis, gouty arthritis, hemiglossitis, hermaphroditus, hidradenitis, hydradenitis, jejunoileitis, keratoiritis, lithonephritis, mastadenitis, mesophlebitis, metrophlebitis, mononeuritis, myocarditis, myofascitis, myometritis, neurodermitis, oesophagitis, panniculitis, pansinusitis, paradenitis, parametritis, paranephritis, paraproctitis, parodontitis, periarthritis, peribronchitis, pericementitis, perichondritis, pericystitis, peridesmitis, perigastritis, perimetritis, perinephritis, perineuritis, periosteitis, periostitis, periproctitis, peritonitis, perityphlitis, polychondritis, polyneuritis, proctocolitis, pylephlebitis, pyometritis, radiculitis, rectocolitis, rhinotracheitis, scleradenitis, sesamoiditis, spondylarthritis, thrombophlebitis, vaginalitis, vesiculitis, vestibulitis

6 syllables:
achillobursitis, acrodermatitis, aerosinusitis, analysis situs, arytenoiditis, balanoposthitis, barosinusitis, blepharadenitis, blepharoadenitis, canaliculitis, cholangiolitis, dacryadenitis, dacryoadenitis, delta hepatitis, diverticulitis, endocervicitis, enterogastritis, epicondylitis, epididymitis, fibromyositis, iridocyclitis, keratoscleritis, laryngotracheitis, leptomeningitis, mediastinitis, meibomianitis, mycomyringitis, nasopharyngitis, nasosinusitis, neurochoroiditis, neurodermatitis, neuromyositis, oligoarthritis, osteoarthritis, osteochondritis, osteophlebitis, pachymeningitis, panbronchiolitis, panencephalitis, parasynovitis, parencephalitis, parenchymatitis, periadenitis, periaortitis, pericholangitis, pericolonitis, pericoronitis, perihepatitis, perimeningitis, periodontitis, periophthalmitis, periovaritis, perisalpingitis, perisigmoiditis, periurethritis, photodermatitis, photokeratitis, photoretinitis, phytodermatitis, pleurohepatitis, pododermatitis, polyadenitis, polyangiitis, polymyositis, polyserositis, proctosigmoiditis, pyelonephritis, pyomyositis, pyoperitonitis, pyosalpingitis, radioneuritis, rheumatoid arthritis, rhinopharyngitis, rhinosinusitis, rokas jokubaitis, sacroiliitis, sclerochoroiditis, sclerokeratitis, serum hepatitis, sialadenitis, sialoadenitis, sialodochitis, steatohepatitis, tendosynovitis, tendovaginitis, tenosynovitis, tenovaginitis, thrombolymphangitis, trachelomyitis, tracheobronchitis, viral hepatitis, vulvovaginitis

7 syllables:
acarodermatitis, actinodermatitis, adenopharyngitis, cephalomeningitis, cerebromeningitis, choriomeningitis, dermatomyositis, endomyocarditis, endomyometritis, enterohepatitis, erythrodermatitis, gastroduodenitis, gingivostomatitis, glomerulonephritis, hyaloserositis, infectious hepatitis, iridochoroiditis, iridokeratitis, laryngopharyngitis, leukoencephalitis, meningomyelitis, metroperitonitis, oophorosalpingitis, osteomyelitis, pelviperitonitis, periencephalitis, perifolliculitis, pharyngolaryngitis, pneumoperitonitis, poliomyelitis, pseudofolliculitis, radiodermatitis, retinochoroiditis, retroperitonitis, vasovesiculitis

8 syllables:
chorioamnionitis, cystopyelonephritis, degenerative arthritis, encephalomeningitis, encephalomyelitis, epidemic meningitis, epididymo-orchitis, hashimoto's thyroiditis, keratoconjunctivitis, lethargic encephalitis, meningoencephalitis, orchiepididymitis, osteoperiostitis, phytophotodermatitis, polioencephalitis, prostatovesiculitis

9 syllables:
encephalomyocarditis, epidemic encephalitis, juvenile rheumatoid arthritis, laryngotracheobronchitis

11 syllables:
polioencephalomyelitis

2 syllables:
midas, nidus, ficus, picus, ibis, rhibhus

3 syllables:
emphasis, nebulous, elements, hephaestus, tetanus, sedulous, petulance, offenseless, fecklessness, membranous, restlessness, excellence, exodus, evidence, pendulous, recklessness, edifice, blessedness, helplessness, renascence, precedence, helpfulness, pestilence, tremulous, prevalence, eminence, tenebrous, fretfulness, aesculus, pegasus, endlessness, resinous, credulous, resonance, dreadfulness, elephants, eloquence, pleasantness, regulus, daedalus, wood ibis, gentleness, healthfulness, precipice, petalous, specialness, negligence, tendinous, tenuous, emulous, femaleness, genesis, xenopus, venomous, benelux, elegance, relevance, delegates, desmanthus, emphasise, estimates, friendlessness, gempylus, haemanthus, jejuneness, mespilus, methodists, penstemon deustus, precedents, preciousness, restfulness, senselessness, sentiments, settlements, sexlessness, specialists, temperateness, vengefulness, zestfulness, azygous, chlamydeous

4 syllables:
contentiousness, benevolence, inelegance, antecedence, homozygous, preeminence, beneficence, unpleasantness, affectedness, apetalous, directionless, edematous, shigellosis, state's evidence, maleficence, pink elephants, persepolis, incredulous, irrelevance, intelligence, malevolence, eleven-plus, necessitous, acceptableness, adenosis, agenesis, cnicus, defencelessness, defenselessness, developments, digenesis, distressfulness, dysgenesis, essentialness, forgetfulness, good-temperedness, impetuousness, incessantness, licentiousness, momentousness, neglectfulness, oogenesis, pretentiousness, re-emphasise, relentlessness, respectfulness, successfulness, tendentiousness, unhealthfulness, unhelpfulness, achlamydeous, genus ibis, ibis ibis, sacred ibis

5 syllables:
macrocephalous, leptocephalus, atelectasis, conscientiousness, hearsay evidence, hydrocephalus, heterozygous, direct evidence, microcephalous, overemphasis, acrocephalus, ambidextrousness, androgenesis, anencephalous, arctocephalus, autogenesis, biogenesis, blastogenesis, cacogenesis, caenogenesis, cainogenesis, cenogenesis, chirocephalus, cogent evidence, cynocephalus, cytogenesis, epigenesis, epinephelus, gynogenesis, kainogenesis, kenogenesis, metagenesis, microcephalus, monogenesis, moral excellence, myxocephalus, ontogenesis, palingenesis, pathogenesis, phylogenesis, pyrocephalus, rule of evidence, sacrilegiousness, sarcocephalus, stenopelmatus, unacceptableness, unpretentiousness, xenogenesis

6 syllables:
magnetic resonance, indirect evidence, dicotyledonous, abiogenesis, adult intelligence, agamogenesis, amelogenesis, anthropogenesis, atherogenesis, combat intelligence, current intelligence, funeral-residence, gorgonocephalus, heterocephalus, heterogenesis, nuclear resonance, parthenogenesis, platypoecilus, showing intelligence, signals intelligence, spermatogenesis, terrain intelligence, unconscientiousness, verbal intelligence

7 syllables:
circumstantial evidence, borderline intelligence, nonverbal intelligence, strategic intelligence, tactical intelligence

8 syllables:
artificial intelligence, electronics intelligence, proton magnetic resonance, security intelligence, showing lack of intelligence, telemetry intelligence

9 syllables:
communications intelligence