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

15 letter words

geostrophically[26]

13 letter words

oscillography[24], orthoepically[23], geotropically[21]

12 letter words

oscillograph[20], cryptologies[20], petrological[17]

11 letter words

geophysical[22], phycologies[22], phagocytose[22], phycologist[22], hypogastric[22], spherically[21], trophically[21], phraseology[20], eschatology[20], phytologies[20], grapholects[19], geostrophic[19], typological[19], spirochetal[18], chloroplast[18], collotypies[18], rheological[17], haplologies[17], ethological[17], theological[17], pathologies[17], carpologies[16], apologetics[16], colportages[16], oscillatory[16], serological[14], allotropies[13]

10 letter words

hypergolic[21], phagocytes[21], copyrights[21], orphically[20], photically[20], hypocrites[20], archeology[19], gothically[19], trichology[19], coliphages[18], hagioscope[18], pathologic[18], grapholect[18], heroically[18], escapology[18], phyllaries[18], typhlosole[18], hysterical[18], chrysolite[18], chrysotile[18], polyhistor[18], photocells[17], splotchier[17], poetically[17], tropically[17], collotypes[17], spectrally[17], logophiles[16], schoolgirl[16], oleographs[16], pyrologies[16], heliolatry[16], cytologies[16], logotypies[16], typologies[16], gyropilots[16], prelogical[15], chloralose[15], apologetic[15], colportage[15], petrologic[15], paleoliths[15], orthoclase[15], erotically[15], societally[15], allotypies[15], sterically[15], epistolary[15], allotropic[14], rheologist[14], coprolites[14], oligoclase[13], colligates[13], allosteric[12], sclerotial[12], oscillator[12], allotropes[12], allegorist[11], legislator[11]

9 letter words

coliphage[17], spherical[16], prechills[16], preschool[16], photocell[16], plethoric[16], orthoepic[16], poachiest[16], potlaches[16], chipotles[16], helicopts[16], sociopath[16], scotophil[16], chapiters[16], calthrops[16], crapshoot[16], logophile[15], rheologic[15], oleograph[15], oesophagi[15], oligarchs[15], theologic[15], lethargic[15], graphites[15], plighters[15], grapeshot[15], coalholes[14], paleolith[14], prothalli[14], geotropic[14], sailcloth[14], oilcloths[14], isophotal[14], hillcrest[14], chelators[14], chlorates[14], trochleas[14], acroliths[14], chlorites[14], clothiers[14], atrophies[14], plethoras[14], heliports[14], portholes[14], calliopes[13], callipers[13], caprioles[13], scalloper[13], acropolis[13], precoital[13], coprolite[13], scapolite[13], apostolic[13], ghastlier[13], litharges[13], thirlages[13], ghostlier[13], regoliths[13], particles[13], operatics[13], pectorals[13], tropicals[13], esotropic[13], porticoes[13], allegoric[12], aerologic[12], apologies[12], apologise[12], serologic[12], aspergill[12], pillagers[12], gallopers[12], colligate[12], collagist[12], ecologist[12], pilotages[12], gallipots[12], apologist[12], aeroliths[12], horsetail[12], isotheral[12], lotharios[12], prologist[12], rocailles[11], corollate[11], allotrope[11], localites[11], oscillate[11], teocallis[11], latosolic[11], apostille[11], loricates[11], sclerotia[11], sectorial[11], collarets[11], cloistral[11], collators[11], colostral[11], epilators[11], saprolite[11], preallots[11], esotropia[11], spoliator[11], troopials[11], pistolero[11], glorioles[10], allergist[10]