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From letters F, R, E, N, C, H, I, F, I, C, A, T, I, O, N  I made following words

15 letter words

frenchification[28]

11 letter words

antichoicer[18], reification[16]

10 letter words

chiffonier[21], technician[17], antichoice[17], fantoccini[17], anchoritic[17], interchain[15], antiheroic[15], infarction[15], infraction[15], concertina[14], herniation[13], interionic[12]

9 letter words

caffeinic[19], chieftain[17], officiate[17], affection[17], officiant[17], forficate[17], cofinance[16], choreatic[16], nontariff[15], financier[14], infection[14], trichinae[14], fornicate[14], anchorite[14], antechoir[14], nicotinic[13], circinate[13], accretion[13], anorectic[13], ornithine[12], carnitine[11], container[11], crenation[11], incretion[11]

8 letter words

chaffier[19], chanfron[16], anechoic[15], chaconne[15], cinchona[15], chancier[15], chicaner[15], encroach[15], corniche[15], enchoric[15], atechnic[15], catechin[15], coinfect[15], catchier[15], rachitic[15], thoracic[15], trochaic[15], ricochet[15], orchitic[15], fenthion[14], confiner[13], ethician[13], inchoate[13], nanotech[13], artifice[13], hieratic[13], trichina[13], intrench[13], anchoret[13], fraction[13], infector[13], anorthic[13], friction[13], ornithic[13], cocinera[12], ciceroni[12], oiticica[12], acetonic[12], aconitic[12], cationic[12], acentric[12], accentor[12], cratonic[12], narcotic[12], concerti[12], necrotic[12], infinite[11], thionine[11], antihero[11], notifier[11], inthrone[11], inaction[10], cotinine[10], nicotine[10], citrinin[10], actioner[10], anoretic[10], creation[10], reaction[10], triennia[8], anointer[8], reanoint[8]

7 letter words

affiche[18], chiffon[18], chaffer[18], caffein[15], archfoe[15], officer[15], caitiff[15], traffic[15], chicane[14], conchae[14], chicano[14], conchie[14], chancer[14], chancre[14], caroche[14], coacher[14], cochair[14], choicer[14], choreic[14], chronic[14], technic[14], chaotic[14], confect[14], catcher[14], finance[12], enchain[12], confine[12], chinone[12], fancier[12], archine[12], hircine[12], orifice[12], coinfer[12], conifer[12], chorine[12], chianti[12], ichnite[12], nitchie[12], enchant[12], achiote[12], faction[12], fiction[12], thionic[12], nonfact[12], theriac[12], itchier[12], chanter[12], tranche[12], frantic[12], infarct[12], infract[12], cithern[12], cithren[12], cocaine[11], oceanic[11], canonic[11], acronic[11], cornice[11], crocein[11], crocine[11], concern[11], actinic[11], coenact[11], conceit[11], concent[11], connect[11], icteric[11], centric[11], finnier[10], inferno[10], infante[10], fontina[10], thionin[10], fainter[10], hairnet[10], inearth[10], therian[10], anionic[9], coniine[9], cannier[9], narcein[9], cinerin[9], oneiric[9], ancient[9], aconite[9], connate[9], actinon[9], contain[9], nicotin[9], ceratin[9], certain[9], creatin[9], tacrine[9], citrine[9], crinite[9], inciter[9], neritic[9], enation[7], inertia[7]