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From letters A, N, T, I, R, O, M, A, N, T, I, C, I, S, M  I made following words

15 letter words

antiromanticism[21]

13 letter words

antiromantics[17]

12 letter words

criminations[16], antiromantic[16], ministration[14]

11 letter words

romanticism[17], animatronic[15], crimination[15], mastication[15], miscitation[15], romanticist[15], marinations[13], incitations[13], intimations[13], transaction[13], nonartistic[13]

10 letter words

microminis[16], antiracism[14], morticians[14], manicottis[14], masticator[14], marination[12], nicotianas[12], animations[12], carnations[12], incitation[12], intimation[12], imitations[12], nictations[12], antiracist[12], inartistic[12], ministrant[12], castration[12], constraint[12], sanitation[10], initiators[10], tarnations[10], nitrations[10], transition[10]

9 letter words

micromini[15], ammoniacs[15], ammonitic[15], miasmatic[15], insomniac[13], armonicas[13], macaronis[13], marocains[13], antimonic[13], antinomic[13], mortician[13], animistic[13], animatism[13], anosmatic[13], aromatics[13], amoristic[13], narcotism[13], romantics[13], mortmains[13], manicotti[13], triatomic[13], atomistic[13], stromatic[13], nicotiana[11], animation[11], carnation[11], actinians[11], amanitins[11], maintains[11], santonica[11], inactions[11], onanistic[11], citrinins[11], intrinsic[11], raincoats[11], animators[11], constrain[11], transonic[11], imitation[11], nictation[11], animatist[11], incitants[11], citations[11], anatomist[11], antiatoms[11], nonstatic[11], tarantism[11], imitators[11], tractions[11], striction[11], intromits[11], antiarins[9], sanitoria[9], initiator[9], tarnation[9], nitration[9], satiation[9], natations[9], striation[9], nonartist[9], strontian[9]

8 letter words

ammoniac[14], minicams[14], marasmic[14], amnionic[12], armonica[12], macaroni[12], marocain[12], morainic[12], maniocas[12], simoniac[12], ammonias[12], minicars[12], criminis[12], narcomas[12], minorcas[12], mannitic[12], anatomic[12], amniotic[12], aromatic[12], romantic[12], mortmain[12], actinism[12], mainmast[12], iotacism[12], monastic[12], monistic[12], nomistic[12], scimitar[12], mantrams[12], marcatos[12], acrotism[12], trisomic[12], amitotic[12], atticism[12], mastitic[12], catmints[12], stomatic[12], incision[10], insomnia[10], ocarinas[10], sonarman[10], actinian[10], amanitin[10], maintain[10], inaction[10], citrinin[10], trainman[10], raincoat[10], animator[10], actinias[10], isatinic[10], cantinas[10], actinons[10], canonist[10], contains[10], sanction[10], sonantic[10], nicotins[10], martians[10], tamarins[10], martinis[10], mistrain[10], aoristic[10], carotins[10], cortinas[10], crostini[10], incitant[10], citation[10], antiatom[10], imitator[10], traction[10], intromit[10], titanism[10], intimist[10], instinct[10], oscitant[10], tactions[10], stiction[10], constant[10], castrati[10], artistic[10], transact[10], tantrism[10], transmit[10], castrato[10], citators[10], ricottas[10], stromata[10], tritomas[10], contrast[10], antiarin[8], sonatina[8], intarsia[8], natation[8], antiriot[8], titanias[8], ostinati[8], annattos[8], intrants[8], arnattos[8]