1 syllable:
boil, boyle, broil, choil, coil, coile, coyle, croyle, doyle, droil, droyle, foil, foyle, hoyle, meule, moile, moyl, moyle, quoil, roil, royle, scroyle, sgoil, soil, soyle, spoil, toil, toile, voile

2 syllables:
aboil, accoil, airfoil, amsoil, anoil, assoil, bemoil, benzoyl, bog soil, britoil, caproyl, char-broil, charbroil, choke coil, cinqfoil, coiled-coil, despoil, emboil, embroil, entoil, estoile, etoile, fermoyle, field coil, free-soil, gaelscoil, garboil, gargoyle, gasoil, gatoil, gold foil, guilfoil, gumboil, gurgoyle, hard-boil, imboil, jetfoil, kinoyl, leaf soil, lukoil, milfoil, night soil, o'boyle, oboyle, octoyl, outtoil, palm-oil, pan-broil, parboil, pennzoil, potboil, quinoyl, re-coil, reboil, recoil, rockfoil, septfoil, setfoil, sexfoil, snake-oil, snakeoil, spark coil, sparpoil, statoil, subsoil, tinfoil, tin foil, topsoil, trefoil, turmoil, uncoil, unoil, upcoil, whale-oil

3 syllables:
aerofoil, bel-accoyle, bio-oil, carbamoyl, castor-oil, choking coil, cinquefoil, conan doyle, counterfoil, delhi boil, desert soil, disembroil, engarboil, feather-foil, featherfoil, gumbo soil, hexafoil, hispanoil, hydrofoil, iqfoil, multifoil, nagercoil, oleoyl, oven broil, overboil, overtoil, parafoil, perdifoil, polyfoil, prairie soil, quadrifoil, quarterfoil, quatrefoil, quintefoil, rotor coil, supercoil, surface soil, susan boyle, telecoil, tesla coil, tundra soil, undersoil

4 syllables:
a. conan doyle, ignition coil, induction coil, primary coil

5 syllables:
alluvial soil, aluminum foil, arthur conan doyle, residual soil, secondary coil

6 syllables:
sir arthur conan doyle