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From letters F, E, R, R, O, M, A, G, N, E, T, I, S, M, S  I made following words

15 letter words

ferromagnetisms[23]

14 letter words

ferromagnetism[22]

12 letter words

ferrimagnets[18], ferromagnets[18], mastersinger[15]

11 letter words

ferrimagnet[17], ferromagnet[17], freemartins[16], manifestoes[16], manifesters[16], manometries[15], reforesting[15], monetarisms[15], fortressing[15], ergotamines[14], remastering[14], somerseting[14], ringmasters[14], stereograms[14], monasteries[13], ironmasters[13], reasserting[12], reassorting[12], reassertion[11]

10 letter words

reformisms[17], firmaments[17], metformins[17], forearming[16], seismogram[15], freemasons[15], freemartin[15], antireform[15], gemmations[15], manifester[15], stammering[15], fromenties[15], reformates[15], fermentors[15], magnetisms[15], manifestos[15], firestorms[15], reformists[15], transforms[15], foreigners[14], manometers[14], monetarism[14], ferretings[14], merriments[14], forestages[14], fosterages[14], stammerers[14], mergansers[13], ergotamine[13], antimerger[13], germinates[13], steamering[13], morganites[13], remigrates[13], ringmaster[13], stereogram[13], rotiferans[13], magnesites[13], magnetises[13], isogametes[13], streamings[13], gasometers[13], firestones[13], forestries[13], rosemaries[12], ironmaster[12], stramonies[12], moisteners[12], remoistens[12], rainstorms[12], orangeries[11], organisers[11], regression[11], generators[11], stingarees[11], estrangers[11], serrations[10]

9 letter words

reformism[16], misframes[16], firmament[16], metformin[16], reframing[15], reforming[15], fragments[15], engrammes[14], forenames[14], freemason[14], gammoners[14], informers[14], reinforms[14], gemminess[14], foaminess[14], misfeasor[14], misrefers[14], gemmation[14], aforetime[14], reformate[14], fermentor[14], magnetism[14], manifesto[14], foretimes[14], fomenters[14], reformats[14], firestorm[14], reformist[14], restiform[14], foreigner[13], farseeing[13], ferriages[13], fingerers[13], fairgoers[13], forgeries[13], seminomas[13], ossifrage[13], memorises[13], misnomers[13], manometer[13], ferreting[13], merriment[13], memoriter[13], mortarmen[13], meantimes[13], ammonites[13], figeaters[13], festering[13], forestage[13], fosterage[13], frontages[13], foresting[13], fostering[13], mortmains[13], stammerer[13], merganser[12], armigeros[12], renograms[12], germiness[12], organisms[12], germinate[12], reteaming[12], morganite[12], remigrate[12], rotiferan[12], mortaring[12], geminates[12], magnesite[12], magnetise[12], isogamete[12], emigrates[12], emigrants[12], mastering[12], streaming[12], regiments[12], gasometer[12], firestone[12], torrefies[12], migrators[12], frontiers[12], isomerase[11], masonries[11], romanises[11], emersions[11], merriness[11], ransomers[11], antimeres[11], osmeteria[11], moistener[11], remoisten[11], streamier[11], orangerie[10], regainers[10], organiser[10], erigerons[10], organises[10], egression[10], resigners[10], engrosser[10], garrisons[10], retearing[10], generator[10], agentries[10], gratinees[10], reseating[10], stingaree[10], orangiest[10], stereoing[10], estranger[10], arresting[10], serrating[10], resorting[10], reasoners[9], retainers[9], ternaries[9], serration[9], orienters[9], orneriest[9], reorients[9]