2 syllables:
auer, bauer, baur, bougher, bower, brauer, brougher, brower, clouer, clower, cower, dauer, dour, f-hour, flour, flower, fower, frower, gauer, giaour, glower, gower, grauer, h-hour, hauer, hour, how're, hower, kauer, klauer, knauer, l-hour, lauer, mauer, nauer, our, plougher, plower, prower, rauer, sauer, schauer, scour, shower, souir, sour, tauer, tower, trauer, trower, vower

3 syllables:
airpower, allower, avower, badflower, ball-flower, ballflower, beebower, beflower, belflower, bellflower, bloodflower, brainpower, bunchflower, cheeseflower, coneflower, cornflour, cornflower, crowflower, cupflower, dayflower, deflour, deflower, devour, efflower, embower, empower, endower, enflower, fillauer, firepower, flame-flower, flameflower, foamflower, foreshower, gang-flower, gerstlauer, globeflower, great-power, half-hour, high-power, hightower, horse-power, horsepower, hufbauer, icepower, impower, kowtower, landauer, liptauer, litauer, low-power, lung-power, lyre-flower, lyreflower, man-hour, manpower, mayflower, mist-flower, mistflower, monkflower, moonflower, mossflower, noon-flower, off-hour, outpower, pasque-flower, reflower, repower, rush-hour, safflower, schongauer, seapower, shad-flower, shadflower, shall-flower, shell-flower, shellflower, simtower, snail-flower, snailflower, spoonflower, starflower, strawflower, sunflower, sunpower, sunshower, swan-flower, swanflower, tail-flower, tailflower, thatpower, three-hour, tongue-flower, tongueflower, trustpower, twinflower, unflower, unpower, wallflower, wandflower, watchtower, watt-hour, waxflower, welltower, wildflower, willpower, windflower, windpower, zembower

4 syllables:
ampere-hour, blanketflower, broccoflower, butter-flower, butterflower, candlepower, cauliflower, chiggerflower, colliflower, cuckooflower, disavower, disempower, eisenhower, elderflower, fennelflower, finger-flower, fingerflower, gilliflower, gillyflower, gutterflower, helmetflower, honey-flower, honeyflower, hyperpower, icenhower, july-flower, lumen-hour, motivepower, overpower, pasqueflower, passionflower, pricasour, quarter-hour, satin-flower, spiderflower, superpower, underpower, vavasour, waterpower, womanpower

5 syllables:
eleventh-hour, horsepower-hour, kilowatt-hour, megawatt-hour, nuclear-power, peopleperhour

6 syllables:
flower-of-an-hour, flowers-of-an-hour

2 syllables:
scourer

3 syllables:
devourer