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From letters M, E, T, A, L, L, O, G, R, A, P, H, I, C  I made following words

14 letter words

metallographic[24]

12 letter words

metaphorical[21]

11 letter words

archipelago[19], allographic[19], lamplighter[19]

10 letter words

macrophage[20], microphage[20], phlegmatic[20], alphameric[19], camphorate[19], amphoteric[19], metaphoric[19], grapholect[18], apothecial[17], prelogical[15], prothallia[15], allometric[14], allopatric[14]

9 letter words

graphemic[19], coliphage[17], graphical[17], lamplight[17], hectogram[17], megalopic[16], philomela[16], camelhair[16], eparchial[16], parochial[16], malachite[16], caliphate[16], apothecia[16], chapteral[16], pragmatic[16], plethoric[16], pictogram[16], polemical[15], heliogram[15], allograph[15], lethargic[15], algorithm[15], logarithm[15], altigraph[15], metacarpi[15], piracetam[15], ametropic[15], preatomic[15], echolalia[14], rachillae[14], alecithal[14], paleolith[14], theriacal[14], prothalli[14], collimate[13], capitella[13], acropetal[13], precoital[13], ametropia[13], atemporal[13], allegoric[12], colligate[12], cartilage[12], metralgia[12], cataloger[12], recatalog[12], aleatoric[11], tamarillo[11], palliator[11], alligator[10]

8 letter words

camphire[17], empathic[17], emphatic[17], echogram[16], agraphic[16], apothegm[16], caliphal[15], apogamic[15], philomel[15], chimaera[15], parhelic[15], prechill[15], poachier[15], orphical[15], amphorae[15], picogram[15], amphoral[15], haematic[15], thalamic[15], hepatica[15], haptical[15], potlache[15], chipotle[15], helicopt[15], hepatoma[15], rhematic[15], achromat[15], trachoma[15], chromate[15], chromite[15], trichome[15], chapiter[15], patchier[15], phreatic[15], teraphim[15], megillah[14], agalloch[14], oligarch[14], homegirl[14], copremia[14], picloram[14], proclaim[14], compiler[14], complier[14], taiglach[14], teiglach[14], megalith[14], compleat[14], ethogram[14], graphite[14], plighter[14], impacter[14], achillea[13], heliacal[13], rachilla[13], heroical[13], alachlor[13], parhelia[13], apholate[13], allopath[13], theriaca[13], tracheal[13], thoracal[13], chelator[13], chlorate[13], trochlea[13], acrolith[13], chlorite[13], clothier[13], atheroma[13], camellia[12], alopecia[12], calliope[12], lacrimal[12], micellar[12], millrace[12], acromial[12], calliper[12], capoeira[12], capriole[12], proemial[12], impellor[12], calamite[12], climatal[12], metallic[12], celomata[12], atomical[12], taillamp[12], poetical[12], lipomata[12], litharge[12], thirlage[12], metrical[12], regolith[12], aromatic[12], placater[12], particle[12], prelatic[12], alogical[11], collegia[11], pelagial[11], allergic[11], pellagra[11], pillager[11], galloper[11], glaciate[11], gliomata[11], pilotage[11], gallipot[11], tragical[11], gematria[11], aerolith[11], armillae[10], rocaille[10], allocate[10], localite[10], teocalli[10], palliate[10], tailrace[10], material[10], ramtilla[10], erotical[10], loricate[10], collaret[10], clitoral[10], amitrole[10], rolamite[10], martello[10], parietal[10], patellar[10], galleria[9], arillate[8]