4 syllables:
algometer, atmometer, barometer, bathometer, ceilometer, chronometer, drosometer, durometer, femtometer, fluorometer, geometer, hectometer, hodometer, hydrometer, hygrometer, hypsometer, kilometer, lactometer, micrometer, odometer, optometer, osmometer, pedometer, photometer, picometer, psychrometer, pycnometer, pyrometer, rheometer, sclerometer, seismometer, spectrometer, speedometer, spherometer, spirometer, stethometer, tachometer, thermometer, tintometer, udometer, viscometer

5 syllables:
acetometer, air thermometer, anemometer, areometer, audiometer, craniometer, declinometer, densitometer, dilatometer, dynamometer, electrometer, eudiometer, extensometer, gas thermometer, goniometer, heliometer, inclinometer, katharometer, magnetometer, mass spectrometer, meat thermometer, mileometer, nephelometer, olfactometer, ophthalmometer, opisometer, penetrometer, piezometer, pluviometer, pneumatometer, radiometer, reflectometer, refractometer, respirometer, saccharometer, sensitometer, tacheometer, tensiometer, urinometer, variometer

6 syllables:
accelerometer, beckman thermometer, candy thermometer, cubic kilometer, esthesiometer, evaporometer, hemacytometer, interferometer, microphotometer, oven thermometer, platinum thermometer, potentiometer, pyrheliometer, spectrophotometer, telethermometer, thermohydrometer

7 syllables:
centigrade thermometer, clinical thermometer, electric thermometer, fahrenheit thermometer, mercury barometer, mercury thermometer, radiomicrometer, resistance thermometer, reversing thermometer, vernier micrometer

8 syllables:
electrodynamometer

9 syllables:
radio interferometer

11 syllables:
maximum and minimum thermometer

3 syllables:
brontosaur, sloganeer, hosteller, monitor, hollander, godmother, nodular, polymer, proposer, jocular, cockchafer, sodbuster, popular, cocklebur, modeler, hogchoker, goddaughter, commodore, colander, columnar, alcazar, oliver, blockbuster, pompadour, bolivar, gospeler, modeller, monomer, commissar, globular, almoner, onager, stomacher, gobbler, gossamer, commoner, nonpolar, pothunter, conifer, nothosaur, gossiper, slopseller, common murre, cottager, gospeller, groveller, holloware, ocular, promiser, promisor, quadrature, swashbuckler, troposphere, wobbler

4 syllables:
biographer, astronomer, unpopular, bilocular, demographer, photographer, pornographer, binocular, philosopher, astrologer, subocular, geographer, reconciler, siphonophore, assam rubber, black hollander, compositor, copolymer, cosmographer, dock-walloper, ethnographer, heart monitor, horologer, involucre, lithographer, pisanosaur, typographer

5 syllables:
interlocutor, lexicographer, choreographer, ovipositor, vinyl polymer, bibliographer, oceanographer, press photographer, radiographer, simon bolivar

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

7 syllables:
political commissar

9 syllables:
electronic fetal monitor