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

15 letter words

grammaticalness[22]

14 letter words

sacramentalism[20]

12 letter words

sacramentals[16]

11 letter words

grammatical[18], analemmatic[17], sacramental[15], centralisms[15], mainstreams[15], martingales[14], scarlatinas[13]

10 letter words

scrimmages[17], clamminess[16], mascaraing[15], mismanages[15], massacring[15], macerating[15], trammeling[15], centigrams[15], stammering[15], magnetisms[15], calamaries[14], catamenial[14], semantical[14], centralism[14], mainstream[14], mentalisms[14], marcasites[14], sacraments[14], miscreants[14], managerial[13], analgesics[13], lacerating[13], martingale[13], analgetics[13], escalating[13], cartilages[13], metralgias[13], marginates[13], martingals[13], streamings[13], caesarians[12], carnassial[12], arsenicals[12], scarlatina[12], ascertains[12], sectarians[12], interclass[12], larcenists[12], samaritans[12], analgesias[11]

9 letter words

engrammic[16], scrimmage[16], scramming[16], tagmemics[16], cameraman[15], racemisms[15], clammiest[15], mamaligas[14], mismanage[14], mailgrams[14], armagnacs[14], screaming[14], slammings[14], centigram[14], cremating[14], magnetics[14], magnetism[14], analcimes[13], calamines[13], analemmas[13], calamaris[13], amnesiacs[13], melanisms[13], caesarism[13], alarmisms[13], catamenia[13], calamites[13], melismata[13], calamints[13], claimants[13], mentalism[13], marcasite[13], sacrament[13], miscreant[13], armaments[13], classmate[13], semantics[13], amassment[13], mainmasts[13], ceramists[13], mistraces[13], scimetars[13], smarmiest[13], analgesic[12], angelicas[12], salaaming[12], clearings[12], rescaling[12], marginals[12], maligners[12], malingers[12], cassingle[12], magnesias[12], caressing[12], agnatical[12], analgetic[12], cartilage[12], metralgia[12], marginate[12], martingal[12], trameling[12], glaciates[12], caseating[12], antalgics[12], ligaments[12], gematrias[12], magistral[12], recasting[12], emigrants[12], mastering[12], streaming[12], almagests[12], misagents[12], megastars[12], magisters[12], sterigmas[12], crestings[12], caesarian[11], arsenical[11], anaclises[11], canalises[11], acariases[11], cesarians[11], mislearns[11], nectarial[11], satanical[11], analcites[11], anelastic[11], laitances[11], laminates[11], stamineal[11], tailraces[11], materials[11], ascertain[11], craniates[11], sectarian[11], ancestral[11], cisternal[11], clarinets[11], larcenist[11], samaritan[11], animaters[11], marinates[11], mislearnt[11], terminals[11], tramlines[11], catalases[11], estancias[11], canistels[11], talismans[11], maltiness[11], melanists[11], smaltines[11], caritases[11], staircase[11], alarmists[11], lamisters[11], misalters[11], sacristan[11], canisters[11], scenarist[11], analgesia[10], geranials[10], gasaliers[10], arginases[10], glariness[10], grainless[10], signalers[10], antiglare[10], alginates[10], astragali[10], gnarliest[10], integrals[10], reslating[10], triangles[10], slangiest[10], stealings[10], tasseling[10], gastraeas[10], astragals[10], asserting[10], astringes[10], ganisters[10], strangles[10], artisanal[9], assailant[9], salariats[9], santerias[9], seatrains[9], snarliest[9]