3 letters:
kyl

4 letters:
bile, dial, file, geil, gile, heil, hile, hyle, i'll, isle, kile, kyle, lile, lyle, mile, nile, pile, pyle, rile, ryle, seil, tile, vile, weil, wile, wyle, zile

5 letters:
aisle, beile, bille, cheil, chyle, deihl, exile, feile, gille, guile, guyle, loeil, meile, niall, ovile, pfeil, phile, phyle, reihl, ruyle, scyle, sheil, smile, speil, spile, stile, style, theil, trial, umile, weill, while, zeile

6 letters:
-phile, -style, aedile, affile, anteil, argyle, argyll, awhile, basyle, cakile, cotyle, d'mile, defile, gobeil, invile, kabyle, mihail, nevile, profil, refile, resile, revile, senile, textil, theile, toluyl, unfile, untile

7 letters:
abaxile, accueil, antheil, apopyle, bashyle, beguile, carlyle, carwile, centile, codasyl, compile, condyle, corbeil, delisle, desfile, distyle, dogpile, enstyle, eustyle, fertile, fluxile, gargyle, gentile, hostile, hotfile, instyle, jyvskyl, logfile, mikhail, misdial, misfile, monteil, panfile, pellile, pentile, profile, protyle, purfile, restyle, seafile, sextile, sommeil, subtile, sundial, systyle, tactile, textile, v.smile, vantuyl, vermeil

8 letters:
air mile, autodial, axostyle, carlisle, datafile, diastyle, domicile, dysodile, enophile, epistyle, erewhile, eriphyle, facsmile, fallbeil, funstyle, hip tile, idlewild, immobile, in style, juvenile, killfile, kurzweil, lyophile, makefile, metafile, mireille, mug file, nailfile, narghile, neophile, neuropil, oldstyle, pamphile, pdophile, pedafile, prostyle, quintile, rockpile, rottweil, sea mile, senkbeil, spondyle, substyle, surstyle, swapfile, symphile, ternopil, textfile, ton-mile, umquhile, urostyle, wohlfeil, woodmeil, xylotile, zoophile

9 letters:
aeolipyle, aerophile, aguachile, areostyle, atmophile, barophile, bisextile, bouteille, camachile, campanile, chamomile, cinephile, costabile, crocodile, cryophile, data file, decastyle, decompile, disk file, draintile, endostyle, envermeil, erstwhile, flat-file, flat file, freestyle, galletyle, gegenteil, half-mile, half mile, halophile, hardstyle, hebephile, hemophile, hexastyle, homestyle, homophile, horophile, hypostyle, interfile, jumpstyle, junk pile, land mile, lifestyle, lipophile, livestyle, main file, meanwhile, megachile, mesophile, metromile, neuropile, new style, octastyle, octostyle, oenophile, old style, pedephile, peristyle, polystyle, presenile, prosopyle, pygostyle, recompile, reconcile, rheophile, shapefile, sharefile, shopstyle, sinophile, somewhile, stockpile, strongyle, swap file, tetraxile, text file, theophile, turnstile, typestyle, unbeguile, unhostile, variabile, versatile, vibratile, wildstyle, wood file, xenophile, xerophile

10 letters:
amphiphile, androphile, anglophile, araeostyle, arctophile, biquintile, bissextile, black bile, blunt file, calciphile, cartophile, chari-nile, chris kyle, chrysotile, cobrastyle, cochenille, coprophile, cross-file, cyclostyle, cyrtostyle, d.a.r.y.l., discophile, doggystyle, elternteil, enneastyle, epicondyle, freekstyle, gallophile, geotextile, gypsophile, haemophile, hair style, half-smile, hippophile, home-style, hydrophile, hygrophile, iconophile, input file, italophile, life-style, life style, lithophile, mercantile, missi pyle, monocotyle, necrophile, nonhostile, nyctophile, otherwhile, pentastyle, percentile, pycnostyle, rejuvenile, ridge tile, roman mile, round file, russophile, sarcophile, sarcostyle, self-exile, sheet pile, slopestyle, taper file, taphophile, tetrastyle, thermopile, three-mile, trash pile, worthwhile

11 letters:
alkaliphile, alkalophile, areosystyle, atomic pile, backup file, bibliophile, binary file, blastochyle, blastostyle, countryfile, dendrophile, detail file, dodecastyle, end-of-file, eosinophile, ephebophile, fingerstyle, for a while, francophile, graecophile, heterophile, hydrocotyle, impeccabile, indian file, irreconcile, japanophile, low-profile, master file, montfermeil, neutrophile, nucleophile, numberphile, output file, oversubtile, pogonophile, polonophile, psammophile, safety isle, scripophile, semisextile, sheath pile, siderophile, single file, spermophile, square mile, thamnophile, xxxenophile, yellow bile

12 letters:
...meanwhile, araeosystyle, cephalostyle, emerald isle, extremophile, germanophile, gerontophile, grey delisle, hispanophile, myrmecophile, psychrophile, quarter mile, ray kurzweil, roofing tile, semiquintile, soil profile, statute mile, swedish mile, torrent file, wait-a-while

13 letters:
amphiprostyle, blood profile, circular file, computer file, country-style, galvanic pile, gangnam style, nautical mile, pancake-style, path of exile, rank-and-file, rank and file, vertical file, writing style

14 letters:
abbey weitzeil, admiralty mile, artistic style, microaerophile, nile crocodile, pseudoprostyle

15 letters:
ascii text file, asian crocodile, cafeteria-style, once in a while

16 letters:
belinda carlisle, expressive style, hyperthermophile, infracaninophile, lily-of-the-nile, lily of the nile, transaction file

17 letters:
african crocodile, geographical mile

18 letters:
population profile

19 letters:
architectural style, government-in-exile, perpendicular style, wavefront .obj file

27 letters:
international nautical mile