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From letters B, I, T, U, M, I, N, I, Z, A, T, I, O, N, S  I made following words

15 letter words

bituminizations[27]

14 letter words

bituminization[26]

12 letter words

unitizations[20], intuitionism[14]

11 letter words

unitization[19], intimations[13], intubations[13], initiations[11]

10 letter words

intimation[12], imitations[12], intubation[12], initiation[10], intuitions[10]

9 letter words

ambitions[13], ambitious[13], misbutton[13], imitation[11], mountains[11], munitions[11], titaniums[11], mutations[11], sinuation[9], intuition[9], situation[9], nutations[9]

8 letter words

ambition[12], bimanous[12], niobiums[12], insomnia[10], antisnob[10], titanism[10], intimist[10], botanist[10], misunion[10], unionism[10], mountain[10], munition[10], manitous[10], tinamous[10], titanium[10], mutation[10], antismut[10], stuntman[10], ostinati[8], unionist[8], nutation[8], tinnitus[8], ouistiti[8], titanous[8], tuitions[8]

7 letter words

mizunas[17], zinnias[15], intombs[11], niobium[11], minibus[11], omnibus[11], stibium[11], numbats[11], subatom[11], amnions[9], mansion[9], onanism[9], minions[9], animist[9], intimas[9], santimi[9], bastion[9], bonitas[9], obtains[9], biotins[9], manitos[9], mattins[9], atomist[9], ioniums[9], nimious[9], bunions[9], minutia[9], manitou[9], tinamou[9], manitus[9], santimu[9], tsunami[9], stannum[9], muntins[9], amounts[9], outmans[9], tubaist[9], mutants[9], buttons[9], muttons[9], anoints[7], nations[7], onanist[7], titians[7], instant[7], station[7], nonsuit[7], tuition[7], intuits[7]

6 letter words

zombis[18], nizams[16], matzos[16], matzot[16], mizuna[16], zinnia[14], obiism[10], intomb[10], ambits[10], iambus[10], busman[10], nimbus[10], numbat[10], submit[10], amnion[8], nomina[8], minion[8], animis[8], saimin[8], simian[8], nanism[8], basion[8], bonsai[8], amnios[8], intima[8], tinman[8], bonita[8], obtain[8], biotin[8], manito[8], tibias[8], binits[8], mantis[8], matins[8], biotas[8], batons[8], bionts[8], tomans[8], inmost[8], monist[8], mattin[8], titman[8], numina[8], ionium[8], bunion[8], nubias[8], animus[8], unbans[8], unmans[8], miaous[8], manitu[8], muntin[8], amount[8], outman[8], autism[8], tabuns[8], subito[8], ostium[8], mounts[8], mutons[8], mutant[8], button[8], mutton[8], tubist[8], utmost[8], anions[6], nasion[6], inions[6], anoint[6], nation[6], isatin[6], sonant[6], nitons[6], titian[6], statin[6], taints[6], tanist[6], titans[6], tatsoi[6], otitis[6], stotin[6], unions[6], unison[6], suntan[6], tauons[6], outsin[6], intuit[6], nutant[6], autist[6], taunts[6], outsat[6], outsit[6]

5 letter words

iambi[9], nimbi[9], bimas[9], animi[7], amino[7], amnio[7], imino[7], anion[5], inion[5]