use '?' for JOKER (blank)

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

15 letter words

fragmentariness[21]

12 letter words

ferrimagnets[18], refrainments[17], arrangements[15], arraignments[15], reassignment[15], mastersinger[15]

11 letter words

ferrimagnet[17], afterimages[17], refrainment[16], freemartins[16], manifesters[16], refastening[15], arrangement[14], arraignment[14], remastering[14], transferase[14], ringmasters[14], transmarine[13], animateness[13], reasserting[12]

10 letter words

afterimage[16], fermenting[16], freemartin[15], manifester[15], seafarings[14], ferretings[14], fastenings[14], margarines[13], manganeses[13], manageress[13], safranines[13], franserias[13], mergansers[13], emarginate[13], antimerger[13], manganites[13], marginates[13], germinates[13], steamering[13], smartening[13], margarites[13], remigrates[13], ringmaster[13], magnesites[13], magnetises[13], assignment[13], streamings[13], reanimates[12], mannerists[12], airstreams[12], anagenesis[11], interregna[11], argentines[11], tangerines[11], stingarees[11], transgenes[11], gannisters[11], estrangers[11], entrainers[10], stannaries[10]

9 letter words

enframing[15], reframing[15], fragments[15], misgrafts[15], airframes[14], misrefers[14], manifests[14], seafaring[13], farseeing[13], enserfing[13], ferriages[13], fingerers[13], ferreting[13], fastening[13], figeaters[13], festering[13], margarine[12], manganese[12], magnesian[12], safranine[12], gramaries[12], marriages[12], franseria[12], merganser[12], margarins[12], magnesias[12], manginess[12], germiness[12], safranins[12], seafarers[12], emanating[12], manganite[12], marginate[12], germinate[12], reteaming[12], germinant[12], margarite[12], remigrate[12], geminates[12], magnesite[12], magnetise[12], faineants[12], gematrias[12], emigrates[12], emigrants[12], mastering[12], streaming[12], regiments[12], grantsman[12], grantsmen[12], fantasies[12], fantasise[12], misagents[12], faintness[12], megastars[12], gamesters[12], magisters[12], sterigmas[12], fasteners[12], refastens[12], infesters[12], anamneses[11], anamnesis[11], merriness[11], reanimate[11], animaters[11], marinates[11], antimeres[11], mannerist[11], airstream[11], streamier[11], trimarans[11], amnesties[11], meatiness[11], masteries[11], smeariest[11], steersman[11], misenters[11], remasters[11], streamers[11], rimesters[11], reearning[10], granaries[10], regainers[10], agenesias[10], sangarees[10], arginases[10], angriness[10], ranginess[10], resigners[10], argentine[10], tangerine[10], retearing[10], narrating[10], rerenting[10], antigenes[10], agentries[10], gratinees[10], reseating[10], stingaree[10], transgene[10], gannister[10], renesting[10], resenting[10], estranger[10], arresting[10], serrating[10], assenting[10], sensating[10], tanginess[10], teargases[10], greasiest[10], estranges[10], greatness[10], sergeants[10], asserting[10], astringes[10], ganisters[10], registers[10], anserines[9], ensnarers[9], insnarers[9], entrainer[9], tanneries[9], retainers[9], ternaries[9], taeniases[9], antisense[9], insensate[9], arsenates[9], serenatas[9], santerias[9], seatrains[9], arsenites[9], irateness[9], resinates[9], stearines[9], teariness[9], inertness[9]