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From letters D, E, T, E, R, M, I, N, A, T, I, V, E  I made following words

13 letter words

determinative[19]

12 letter words

intermediate[15]

11 letter words

terminative[16], determinate[14]

10 letter words

meditative[16], anteverted[14], terminated[13], inveterate[13], itinerated[11]

9 letter words

mediative[15], revetment[14], denervate[13], enervated[13], venerated[13], reinvited[13], traditive[13], advertent[13], remediate[12], minareted[12], determine[12], intimated[12], midinette[12], reemitted[12], determent[12], detriment[12], iterative[12], retentive[12], terminate[11], intimater[11], entreated[10], denitrate[10], intreated[10], itinerate[9]

8 letter words

vitamine[13], averment[13], reinvade[12], ideative[12], eventide[12], vanitied[12], derivate[12], inverted[12], vitiated[12], vendetta[12], revetted[12], rivetted[12], remained[11], meridian[11], emendate[11], dementia[11], reteamed[11], diameter[11], reminted[11], diriment[11], admittee[11], meditate[11], imitated[11], mittened[11], mattered[11], admitter[11], remitted[11], enervate[11], venerate[11], reinvite[11], antevert[11], emeritae[10], antimere[10], intimate[10], intermat[10], martinet[10], intermit[10], detainee[9], detainer[9], retained[9], daintier[9], attendee[9], edentate[9], iterated[9], attender[9], nattered[9], rattened[9], tentered[9], nitrated[9], retinted[9], inertiae[8], intertie[8], retinite[8]

7 letter words

viremia[12], vermian[12], miniver[12], vitamin[12], vitamer[12], varment[12], varmint[12], ravened[11], invader[11], ravined[11], diviner[11], deviate[11], deviant[11], evident[11], invited[11], averted[11], everted[11], tardive[11], riveted[11], verdant[11], vedette[11], vidette[11], amidine[10], diamine[10], amender[10], meander[10], reedman[10], renamed[10], emender[10], reedmen[10], inarmed[10], ermined[10], mediate[10], mediant[10], remated[10], metered[10], readmit[10], demerit[10], dimeter[10], merited[10], mitered[10], retimed[10], timider[10], emitted[10], veinier[10], naivete[10], invitee[10], nervate[10], veteran[10], vitrain[10], inviter[10], vitrine[10], vitiate[10], navette[10], etamine[9], matinee[9], emetine[9], intimae[9], emerita[9], emirate[9], meatier[9], eremite[9], airtime[9], emeriti[9], minaret[9], raiment[9], martini[9], interim[9], mintier[9], termini[9], teatime[9], imitate[9], emitter[9], termite[9], needier[8], denarii[8], inedita[8], entered[8], antired[8], detrain[8], trained[8], inditer[8], nitride[8], dentate[8], detente[8], tainted[8], dinette[8], treated[8], attired[8], trident[8], arenite[7], retinae[7], trainee[7], teenier[7], inertia[7], niterie[7], ariette[7], iterate[7], entreat[7], ratteen[7], ternate[7], intreat[7], iterant[7], nattier[7], nitrate[7], tertian[7], nettier[7], tentier[7], nitrite[7], nittier[7]

6 letter words

mediae[9], demean[9], aidmen[9], aedine[7]