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From letters L, I, M, I, T, L, E, S, S, N, E, S, S, E, S  I made following words

15 letter words

limitlessnesses[17]

13 letter words

limitlessness[15]

12 letter words

timelinesses[14], timelessness[14], listlessness[12]

11 letter words

sliminesses[13], messinesses[13], mistinesses[13], sillinesses[11], stillnesses[11]

10 letter words

seemliness[12], liminesses[12], slimnesses[12], timeliness[12], litenesses[10], steeliness[10], sensitises[10]

9 letter words

smileless[11], menseless[11], sliminess[11], messiness[11], missenses[11], melilites[11], ilmenites[11], melinites[11], timelines[11], seemliest[11], smelliest[11], limitless[11], slimsiest[11], mistiness[11], illnesses[9], silliness[9], senseless[9], sissiness[9], enlistees[9], selenites[9], niellists[9], sensitise[9], stillness[9]

8 letter words

millines[10], limeless[10], liminess[10], missiles[10], missense[10], slimness[10], missises[10], melilite[10], ilmenite[10], melinite[10], timeline[10], emetines[10], enmities[10], elements[10], stillmen[10], itemises[10], timeless[10], elitisms[10], slimiest[10], meetness[10], messiest[10], metisses[10], stemless[10], lineless[8], isleless[8], lensless[8], enlistee[8], selenite[8], lenities[8], niellist[8], steelies[8], silliest[8], sienites[8], liteness[8], setlines[8], snellest[8], lintless[8], instills[8], listless[8], slitless[8], sestines[8], sissiest[8]

7 letter words

milline[9], enemies[9], meinies[9], mislies[9], missile[9], similes[9], nemeses[9], nemesis[9], siemens[9], simnels[9], simlins[9], semises[9], missies[9], missels[9], emetine[9], element[9], telemen[9], itemise[9], elmiest[9], elitism[9], limiest[9], limites[9], millets[9], mentees[9], emetins[9], esteems[9], mestees[9], metisse[9], mitises[9], stimies[9], missent[9], missets[9], nellies[7], sillies[7], enisles[7], ensiles[7], seniles[7], illness[7], lessees[7], sessile[7], senseis[7], seisins[7], lessens[7], sinless[7], sissies[7], eeliest[7], steelie[7], tellies[7], illites[7], sienite[7], stelene[7], lenites[7], lisente[7], setline[7], tensile[7], liniest[7], lentils[7], lintels[7], instill[7], teleses[7], listees[7], telesis[7], tieless[7], listels[7], sestine[7], nestles[7], netless[7], enlists[7], listens[7], silents[7], tinsels[7], instils[7], insists[7]

6 letter words

meinie[8], melees[8], elemis[8], mislie[8], simile[8], milles[8], imines[8], limens[8], simnel[8], simlin[8], emeses[8], emesis[8], missel[8], slimes[8], smiles[8], smells[8], menses[8], mesnes[8], semens[8], messes[8], misses[8], seisms[8], missis[8], nellie[6], nielli[6], lilies[6], enisle[6], ensile[6], senile[6], sileni[6], lessee[6], selles[6], lisles[6], seines[6], sensei[6], niseis[6], seisin[6], lenses[6], lessen[6], snells[6], seises[6], isseis[6], nesses[6], senses[6], sisses[6]