3 syllables:
chyometer, cometer, mhometer, pneometer, prometer, promettre, vomitar, vomiter

4 syllables:
acometer, airometer, algometer, altometer, arthrometer, astrometer, atmometer, attometer, auxometer, axometer, barometer, bathometer, bdellometer, biometer, bogometer, breathometer, capnometer, ceilometer, chartometer, chondrometer, chromometer, chronometer, clapometer, comptometer, conchometer, coolometer, cratometer, cryptometer, cymometer, cyrtometer, cytometer, dendrometer, disdrometer, drosometer, drunkometer, durometer, echometer, femtometer, fluorometer, flushometer, focometer, geometer, glaucometer, gleucometer, glucometer, graphometer, haemometer, haptometer, hectometer, hektometer, hodometer, horometer, hydrometer, hygrometer, hypsometer, iometer, kilometer, lactometer, lensometer, mecometer, meldometer, metrometer, micrometer, monometer, nephometer, nitrometer, octometer, odometer, ombrometer, oncometer, ondometer, optometer, orometer, osmometer, pachometer, pedometer, phacometer, phonometer, phorometer, photometer, phthongometer, picometer, pitchometer, plastometer, platometer, pneumometer, potometer, psophometer, psychometer, psychrometer, pulmometer, pycnometer, pyknometer, pyrometer, quantometer, reometer, rheometer, riometer, sclerometer, scotometer, seismometer, sismometer, slidometer, spectrometer, speedometer, spherometer, sphigmometer, sphygmometer, spirometer, stactometer, stagmometer, staktometer, stethometer, strainometer, stylometer, swingometer, tachometer, tactometer, termometer, thermometer, tintometer, tocometer, trechometer, trekometer, tribometer, trochometer, tromometer, tropometer, udometer, urometer, vibrometer, viscometer, worldometer, xylometer, zymometer

5 syllables:
aberrometer, acetometer, acidometer, adaptometer, air thermometer, albedometer, alcohometer, aleurometer, ametrometer, amperometer, amylometer, anemometer, angulometer, anthracometer, apertometer, araeometer, areometer, arithmometer, astigmometer, atmidometer, audiometer, azotometer, butyrometer, carbonometer, cardiometer, cathetometer, chromatometer, chromoptometer, craniometer, declinometer, deflectometer, densitometer, diagometer, diffractometer, dilatometer, dioptometer, dynamometer, eikonometer, elaeometer, elaiometer, elatrometer, electrometer, ellipsometer, endosmometer, eriometer, eudiometer, extensometer, fluviometer, galactometer, gas thermometer, glycosometer, goniometer, gradiometer, gravitometer, haemadrometer, haematometer, harmonometer, heliometer, hemadrometer, hyetometer, iconometer, inclinnometer, inclinometer, inductometer, infiltrometer, inspirometer, katharometer, kathetometer, keratometer, labidometer, magnetometer, mass spectrometer, meat thermometer, methanometer, micronometer, mileometer, nauropometer, nephelometer, odynometer, oleometer, olfactometer, ophthalmometer, opisometer, opsiometer, orchidometer, oscillometer, ozonometer, penetrometer, piezometer, pluviometer, pneumatometer, pupillometer, pupilometer, pyrgeometer, rachiometer, radiometer, reflectometer, refractometer, respirometer, rhythmometer, roentgenometer, saccharometer, salinometer, scatterometer, scoliometer, sensitometer, sociometer, stadiometer, stalagmometer, strabismometer, tacheometer, taseometer, tellurometer, tensiometer, thoracometer, tithonometer, torsiometer, urinometer, variometer, weatherometer

6 syllables:
absorptiometer, accelerometer, aesthesiometer, albuminometer, apomecometer, arteriometer, astrophotometer, beckman thermometer, bronchospirometer, candy thermometer, chronothermometer, cubic kilometer, cytophotometer, decelerometer, diaphanometer, diathermometer, diffusiometer, ebulliometer, effusiometer, elaterometer, esthesiometer, eurobarometer, evaporometer, exophthalmometer, gastrotonometer, geothermometer, haemacytometer, haematachometer, haemochromometer, haemocytometer, hemacytometer, hemadromometer, hemocytometer, hydrobarometer, interferometer, intervalometer, katathermometer, kinesiometer, meteorometer, microchronometer, microphotometer, microseismometer, nephelodometer, oven thermometer, pantochronometer, parallelometer, parturiometer, perineometer, photographometer, platinum thermometer, potentiometer, pyrheliometer, pyrophotometer, spectrobolometer, spectrofluorometer, spectrophotometer, sphygmotonometer, telethermometer, thermobarometer, thermohydrometer, ultramicrometer, volumenometer

7 syllables:
baraesthesiometer, baresthesiometer, barocyclonometer, cardiotachometer, centigrade thermometer, clinical thermometer, electric thermometer, erythrocytometer, fahrenheit thermometer, gnathodynamometer, hemadynamometer, hemoglobinometer, hydrodynamometer, kinesthesiometer, lactobutyrometer, mercury barometer, mercury thermometer, microdensitometer, myodynamometer, oligochronometer, photoheliometer, pupillostatometer, radiomicrometer, resistance thermometer, reversing thermometer, spectroradiometer, thermesthesiometer, thermoelectrometer, tocodynamometer, vernier micrometer, volta-electrometer

8 syllables:
electro-dynamometer, electrodynamometer, microspectrophotometer, ophthalmodynamometer, radiogoniometer, telehydrobarometer

9 syllables:
radio interferometer

11 syllables:
maximum and minimum thermometer

3 syllables:
editor, messidor, creditor, begetter, messenger, epicure, spellbinder, encipher, stem-winder, registrar, register, stepsister, well-wisher, breadwinner, hemisphere, pedicure, genitor, alcazar, almoner, blockbuster, bolivar, cocklebur, colander, columnar, commissar, commodore, commoner, common murre, conifer, cottager, globular, gobbler, godmother, gospeler, gospeller, gossamer, gossiper, groveller, hollander, holloware, hosteller, jocular, modeler, monitor, monomer, nodular, ocular, oliver, onager, polymer, pompadour, popular, promiser, promisor, quadrature, slopseller, sodbuster, swashbuckler, troposphere, wobbler

4 syllables:
insectivore, subeditor, divestiture, expenditure, non sequitur, cash register, competitor, progenitor, assam rubber, astrologer, astronomer, bilocular, binocular, biographer, black hollander, compositor, copolymer, cosmographer, demographer, dock-walloper, ethnographer, geographer, heart monitor, horologer, involucre, lithographer, philosopher, photographer, pisanosaur, pornographer, subocular, typographer, unpopular

5 syllables:
southern hemisphere, eastern hemisphere, western hemisphere, northern hemisphere, primogeniture, bibliographer, choreographer, interlocutor, lexicographer, oceanographer, press photographer, radiographer, simon bolivar, vinyl polymer

6 syllables:
cerebral hemisphere, african monitor, autobiographer, cardiac monitor, cinematographer, historiographer, silicone polymer

7 syllables:
political commissar

9 syllables:
electronic fetal monitor