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From letters E, T, H, N, O, L, O, G, I, S, T, S  I made following words

12 letter words

ethnologists[16]

11 letter words

ethnologist[15], ethologists[15]

10 letter words

ethologist[14], ghostliest[14], enologists[11], neologists[11]

9 letter words

hosteling[13], lightness[13], nightless[13], histogens[13], slingshot[13], shootings[13], slightest[13], tightness[13], ghostiest[13], holsteins[12], toothless[12], enologist[10], neologist[10], settlings[10], glottises[10], oilstones[9], siltstone[9], snootiest[9]

8 letter words

shooling[12], shingles[12], sloshing[12], goloshes[12], hognoses[12], lightens[12], histogen[12], theologs[12], shooting[12], soothing[12], sleights[12], toothing[12], lightest[12], tightens[12], gothites[12], shotting[12], tonights[12], holiness[11], holstein[11], hotlines[11], neoliths[11], hostiles[11], histones[11], hootiest[11], otoliths[11], thistles[11], soothest[11], loginess[9], isogones[9], gooniest[9], stooling[9], toolings[9], glistens[9], singlets[9], sniglets[9], goosiest[9], ologists[9], tootling[9], settling[9], slotting[9], settings[9], egotists[9], looniest[8], oilstone[8], ostioles[8], stoolies[8], isotones[8], solonets[8], solitons[8], tintless[8], stoniest[8], sootiest[8], tootsies[8], testoons[8]

7 letter words

english[11], shingle[11], hongies[11], shoeing[11], longish[11], goloshe[11], hognose[11], shooing[11], sleighs[11], lighten[11], tholing[11], theolog[11], hooting[11], sleight[11], nighest[11], lengths[11], hogties[11], hosting[11], slights[11], tighten[11], gothite[11], hotting[11], tonight[11], ghettos[11], isohels[10], hotline[10], neolith[10], eoliths[10], holiest[10], hostile[10], ethions[10], histone[10], ooliths[10], hitless[10], sithens[10], hostels[10], holists[10], hotness[10], stonish[10], soothes[10], otolith[10], lithest[10], thistle[10], hotties[10], shotten[10], eloigns[8], legions[8], lingoes[8], longies[8], ologies[8], goonies[8], isogone[8], noogies[8], logions[8], loosing[8], olingos[8], soloing[8], singles[8], losings[8], isologs[8], isogons[8], lentigo[8], looting[8], tooling[8], glisten[8], singlet[8], sniglet[8], tingles[8], logiest[8], longest[8], tiglons[8], gooiest[8], ologist[8], gentoos[8], sooting[8], legists[8], ingests[8], signets[8], egoists[8], stogies[8], stingos[8], tossing[8], stooges[8], letting[8], lotting[8], tooting[8], setting[8], testing[8], egotist[8], glottis[8], loonies[7], insoles[7], lesions[7], lioness[7], loosens[7], solions[7], entoils[7], oolites[7], ostiole[7], stoolie[7], isotone[7], toonies[7], lotions[7], soliton[7], enlists[7], listens[7], silents[7], tinsels[7], nosiest[7], telsons[7], tonsils[7], loosest[7], lotoses[7], soloist[7], soonest[7], stolons[7], litotes[7], toilets[7], toniest[7], tonlets[7], tootsie[7]