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From letters X, E, N, O, L, I, T, H, I, C  I made following words

10 letter words

xenolithic[22]

9 letter words

ichnolite[14], neolithic[14]

8 letter words

xenolith[18], lecithin[13], eolithic[13]

7 letter words

lexicon[16], exciton[16], choline[12], helicon[12], ichnite[12], nitchie[12], chitlin[12], thiolic[12], thionic[12], cholent[12], hotline[10], neolith[10], lection[9]

6 letter words

exilic[15], exonic[15], exotic[15], toxine[13], echini[11], lichen[11], litchi[11], lithic[11], ethnic[11], chitin[11], clothe[11], techno[11], chiton[11], eolith[9], ethion[9], cineol[8], enolic[8], elicit[8], incite[8], client[8], lectin[8], lentic[8], citole[8], noetic[8], notice[8], iolite[6], entoil[6]

5 letter words

helix[15], xenic[14], toxic[14], nixie[12], ixtle[12], extol[12], toxin[12], chiel[10], chile[10], chili[10], lichi[10], chine[10], niche[10], chino[10], ethic[10], letch[10], licht[10], tench[10], cloth[10], notch[10], nihil[8], helio[8], lithe[8], thein[8], thine[8], helot[8], hotel[8], thole[8], litho[8], thiol[8], ceili[7], cline[7], oleic[7], ionic[7], clone[7], colin[7], nicol[7], telic[7], licit[7], telco[7], lotic[7], cento[7], conte[7], oncet[7], ontic[7], tonic[7], eloin[5], olein[5], elint[5], inlet[5], teloi[5], toile[5], lento[5]

4 letter words

ilex[11], nixe[11], exon[11], oxen[11], exit[11], next[11], lech[9], lich[9], chin[9], inch[9], echo[9], loch[9], chon[9], echt[9], etch[9], tech[9], chit[9], itch[9], elhi[7], heil[7], hili[7], helo[7], hole[7], hone[7], hilt[7], hent[7], then[7], hint[7], thin[7], thio[7], holt[7], loth[7], ceil[6], lice[6], cine[6], nice[6], cole[6], coil[6], loci[6], cone[6], once[6], cion[6], coin[6], coni[6], icon[6], clon[6], cite[6], etic[6], celt[6], cent[6], cote[6], otic[6], clot[6], colt[6], lien[4], line[4], enol[4], leno[4], lone[4], noel[4], lino[4], lion[4], loin[4], noil[4], lite[4], tile[4], nite[4], tine[4], inti[4], lent[4], lint[4], tole[4], loti[4], toil[4], note[4], tone[4], into[4]

3 letter words

chi[8], hic[8], ich[8], hie[6], hen[6], hin[6], hoe[6], hon[6], noh[6], eth[6], het[6], ice[5], cel[5], col[5], con[5], lei[3], lie[3], lin[3], nil[3], ole[3], oil[3], eon[3], one[3], ion[3]