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

13 letter words

demographical[24]

11 letter words

demographic[22], archipelago[19]

10 letter words

macrophage[20], microphage[20], alphameric[19], camelopard[17], proclaimed[17]

9 letter words

graphemic[19], diaphragm[18], coliphage[17], graphical[17], megalopic[16], camelhair[16], eparchial[16], paramedic[16], ideograph[16], parochial[16], placoderm[16], cladogram[15], heliogram[15], parodical[14], caprioled[14], paraglide[13]

8 letter words

pachadom[18], camphire[17], cephalad[16], headlamp[16], drachmae[16], chadarim[16], drachmai[16], echogram[16], chromide[16], agraphic[16], pilchard[16], apogamic[15], compiled[15], complied[15], chimaera[15], diagraph[15], parhelic[15], crimpled[15], poachier[15], orphical[15], compadre[15], compared[15], amphorae[15], picogram[15], amphoral[15], halidome[14], heraldic[14], decagram[14], decigram[14], grimaced[14], chloride[14], oligarch[14], homegirl[14], rampaged[14], paradigm[14], podagric[14], copremia[14], picloram[14], proclaim[14], compiler[14], complier[14], camailed[13], melodica[13], heroical[13], coadmire[13], racemoid[13], clamored[13], parhelia[13], implored[13], galopade[12], alopecia[12], railhead[12], madrigal[12], ideogram[12], acromial[12], marigold[12], capoeira[12], podagral[12], capriole[12], prodigal[12], proemial[12], praedial[11], dialoger[10]

7 letter words

champed[17], chomped[17], impeach[16], camphol[16], chamade[15], oghamic[15], edaphic[15], delphic[15], megilph[15], poached[15], drachma[15], charmed[15], marched[15], dharmic[15], chirmed[15], hagadic[14], glochid[14], homaged[14], mochila[14], acaleph[14], clamped[14], epochal[14], clomped[14], omphali[14], charged[14], chimera[14], cheloid[13], haemoid[13], halidom[13], helipad[13], medigap[13], haploid[13], megapod[13], oilcamp[13], compile[13], polemic[13], charade[13], chaired[13], eldrich[13], hadarim[13], roached[13], choired[13], choragi[13], choregi[13], camelid[12], claimed[12], decimal[12], declaim[12], medical[12], magical[12], acholia[12], hidalgo[12], domical[12], melodic[12], hemiola[12], agapeic[12], palaced[12], pelagic[12], aphelia[12], impaled[12], implead[12], apogeic[12], pedocal[12], placoid[12], policed[12], diploma[12], implode[12], hagride[12], achiral[12], rachial[12], charlie[12], grimace[12], hagrode[12], camelia[11], decalog[11], galoped[11], airhead[11], gharial[11], damager[11], diagram[11], cameral[11], caramel[11], ceramal[11], claimer[11], miracle[11], reclaim[11], cordage[11], ergodic[11], alcaide[10], alamode[10], melodia[10], apogeal[10], oedipal[10], cardiae[10], caldera[10], craaled[10], radical[10], decrial[10], radicel[10], radicle[10], glacier[10], gracile[10], madeira[10], alarmed[10], admiral[10], gremial[10], acaroid[10], carload[10], geoidal[9], gladier[9], glaired[9], radiale[8], regalia[8]