2 syllables:
pethor, sethur, shethar, zethar

3 syllables:
denethor

4 syllables:
polyether

2 syllables:
lesser, lever, never, lessor, thresher, pleasure, clever, fresher, treasure, aesir, devoir, ever, heifer, measure, leisure, pressure, zephyr, dresser, sever, aether, chevre, feather, heather, leather, nether, tether, tevere, trevor, weather, wether, whether

3 syllables:
high pressure, square measure, air pressure, depressor, professor, whoever, transgressor, whenever, dissever, endeavor, oppressor, board measure, at leisure, possessor, dry measure, whatever, assessor, displeasure, endeavour, aggressor, refresher, forever, whichever, suppressor, sound pressure, successor, blood pressure, compressor, low pressure, confessor, wherever, tape measure, however, whomever, bad weather, beach heather, bell heather, carrefour, cold weather, crushed leather, fair weather, false heather, flight feather, foot lever, gayfeather, good weather, guenevere, high-pressure, hot weather, long measure, lopressor, oil pressure, ooze leather, quill feather, raw weather, scots heather, sea feather, shoe leather, suppresser, together, wash leather, white feather, white heather, white leather, whit leather, yard measure

4 syllables:
whatsoever, vapor pressure, cubic measure, full professor, liquid measure, common measure, high blood pressure, air compressor, window dresser, acupressure, add together, all together, altogether, band together, bring together, bunch together, cantilever, clap together, close together, come together, compound lever, contour feather, crowd together, desperate measure, draw together, fudge together, get together, golden heather, gold of pleasure, hang together, lash together, league together, live-forever, pack together, patent leather, piece of leather, princess feather, pull together, purple heather, put together, russia leather, saddle feather, sew together, sickle feather, slap together, spike suppressor, stay together, stick together, surge suppressor, tax assessor, throw together

5 syllables:
osmotic pressure, linear measure, calling together, circular measure, cobble together, coming together, compartment pressure, defensive measure, english professor, huddle together, lady of pleasure, living together, primary feather, sexual pleasure, withersoever

6 syllables:
barometric pressure, visiting professor, arterial pressure, assistant professor, diastolic pressure, radiation pressure, atmospheric pressure, brewer's mountain heather, bringing close together, capacity measure, imitation leather, information measure, in the altogether

7 syllables:
associate professor

8 syllables:
instantaneous sound pressure

9 syllables:
acoustic radiation pressure