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From letters E, N, D, O, T, H, E, L, I, O, M, A, T, A  I made following words

14 letter words

endotheliomata[20]

12 letter words

endothelioma[18]

11 letter words

mentholated[17]

10 letter words

dimethoate[16], endothelia[14], theodolite[14], delaminate[13]

9 letter words

metalhead[15], ethmoidal[15], methadone[15], malathion[14], haematite[14], deaminate[12], almandite[12], laminated[12], alimented[12], demential[12], montadale[12], emotional[11], alienated[10], dealation[10], toenailed[10], etiolated[10], antidotal[10]

8 letter words

halidome[14], homeland[14], handloom[14], meathead[14], anthemed[14], hematoid[14], methadon[14], hoteldom[14], anthemia[13], haematin[13], hematein[13], hematine[13], hotelman[13], methanol[13], hotelmen[13], monolith[13], hematite[13], monteith[13], nailhead[12], headline[12], enhaloed[12], headnote[12], anthodia[12], toolhead[12], athetoid[12], endemial[11], lemonade[11], melanoid[11], melodeon[11], anthelia[11], emanated[11], animated[11], diamante[11], dementia[11], lamented[11], oedemata[11], anethole[11], halation[11], nematode[11], manatoid[11], dominate[11], dolomite[11], demotion[11], motioned[11], admittee[11], meditate[11], mittened[11], thionate[11], telethon[11], antimale[10], laminate[10], melanite[10], motional[10], mantelet[10], matelote[10], antiatom[10], dentalia[9], dateline[9], entailed[9], lineated[9], delation[9], deletion[9], entoiled[9], dilatate[9], antedate[9], attained[9], talented[9], dilatant[9], entitled[9], toileted[9], detonate[9], antidote[9], tetanoid[9], dotation[9], alienate[8], etiolate[8]

7 letter words

headman[13], headmen[13], haemoid[13], halidom[13], manhood[13], ethmoid[13], hemline[12], hemiola[12], mahonia[12], manhole[12], hematal[12], thalami[12], methane[12], hematin[12], manihot[12], menthol[12], inhaled[11], loathed[11], lithoed[11], anthoid[11], dhootie[11], toehold[11], emailed[10], limeade[10], leadman[10], leadmen[10], alamode[10], melodia[10], adenoma[10], amidone[10], domaine[10], mandola[10], monadal[10], edemata[10], mediate[10], metaled[10], matilda[10], lethean[10], theelin[10], mandate[10], mediant[10], mantled[10], anethol[10], ethanol[10], hotline[10], neolith[10], demeton[10], athlete[10], emitted[10], mettled[10], laminae[9], oenomel[9], oinomel[9], maleate[9], emanate[9], enemata[9], manatee[9], amentia[9], animate[9], etamine[9], matinee[9], teleman[9], matinal[9], ailment[9], aliment[9], oatmeal[9], animato[9], amniote[9], onetime[9], lomenta[9], omental[9], telamon[9], amotion[9], emotion[9], moonlet[9], moonlit[9], teatime[9], aliened[8], delaine[8], eloined[8], eidolon[8], dealate[8], lanated[8], latened[8], lenited[8], taloned[8], lentoid[8], odonate[8], dentate[8], tainted[8], dinette[8], nettled[8], aeolian[7], taeniae[7], lineate[7], alation[7], elation[7], toenail[7], tetanal[7], entitle[7]