use '?' for JOKER (blank)

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

15 letter words

ferrimagnetisms[23]

14 letter words

ferrimagnetism[22]

12 letter words

ferrimagnets[18], mastersinger[15]

11 letter words

ferrimagnet[17], reimmersing[16], mesmerising[16], freemartins[16], manifesters[16], gentrifiers[15], remastering[14], missteering[14], misregister[14], ringmasters[14], garnierites[12], reasserting[12]

10 letter words

misframing[18], firmaments[17], magnifiers[16], freemartin[15], retrimming[15], mismeeting[15], immigrates[15], manifester[15], stammering[15], immigrants[15], misterming[15], magnetisms[15], gentrifier[14], gentrifies[14], gratifiers[14], ferretings[14], merriments[14], eremitisms[14], stammerers[14], trimerisms[14], reimagines[13], mergansers[13], antimerger[13], germinates[13], steamering[13], remigrates[13], ringmaster[13], magnesites[13], magnetises[13], misseating[13], streamings[13], semainiers[12], seminaries[12], seminarist[12], misentries[12], garnierite[11], stingarees[11], registries[11], estrangers[11]

9 letter words

feminisms[16], misframes[16], firmament[16], magnifier[15], reframing[15], magnifies[15], fragments[15], misgrafts[15], engrammes[14], immersing[14], simmering[14], feminises[14], gemminess[14], misinfers[14], misrefers[14], immigrate[14], immigrant[14], interfirm[14], magnetism[14], mismating[14], metrifies[14], trimmings[14], manifests[14], feminists[14], farseeing[13], ferriages[13], fingerers[13], gasifiers[13], gratifier[13], ferreting[13], merriment[13], meantimes[13], figeaters[13], gratifies[13], eremitism[13], festering[13], fringiest[13], resifting[13], stammerer[13], trimerism[13], immensest[13], smarmiest[13], meristems[13], mesmerist[13], reimagine[12], imageries[12], imaginers[12], migraines[12], merganser[12], fieriness[12], germiness[12], griminess[12], germinate[12], reteaming[12], remigrate[12], geminates[12], magnesite[12], magnetise[12], miseating[12], emigrates[12], emigrants[12], mastering[12], streaming[12], regiments[12], misrating[12], ratifiers[12], terrifies[12], ferritins[12], misagents[12], giantisms[12], satisfier[12], gamesters[12], magisters[12], sterigmas[12], fasteners[12], refastens[12], infesters[12], transfers[12], semainier[11], merriness[11], amenities[11], antimeres[11], streamier[11], amnesties[11], meatiness[11], masteries[11], smeariest[11], steersman[11], misenters[11], mistrains[11], ministers[11], misinters[11], remasters[11], streamers[11], rimesters[11], regainers[10], reraising[10], resigners[10], retearing[10], agentries[10], gratinees[10], reseating[10], stingaree[10], grainiest[10], seriating[10], reignites[10], irrigates[10], estranger[10], arresting[10], serrating[10], stringier[10], gaseities[10], greasiest[10], estranges[10], greatness[10], sergeants[10], asserting[10], astringes[10], ganisters[10], resisting[10], sistering[10], registers[10], strangers[10], restrings[10], stringers[10], stirrings[10], retainers[9], ternaries[9], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], restrains[9], strainers[9], tarriness[9], inserters[9], reinserts[9]

8 letter words

engramme[13], ferriage[12], fingerer[12], imaginer[11], migraine[11], regainer[9], grainier[9]