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

14 letter words

geopoliticians[19]

13 letter words

geopolitician[18]

11 letter words

apologetics[16], geopolitics[16], politicians[15], logistician[14], neologistic[14]

10 letter words

escaloping[15], opalescing[15], apologetic[15], speciating[15], antipolice[14], politician[14], plasticine[14], sincipital[14], politicise[14], speciation[14], neoplastic[14], pleonastic[14], plications[14], politicoes[14], apiologies[13], egoistical[13], soliciting[13], spoliating[13], penologist[13], topsoiling[13], ciliations[12], coalitions[12], epilations[12], positional[12], spoliation[12], antilogies[11]

9 letter words

eclipsing[14], geoponics[14], cisalpine[13], pliancies[13], epsilonic[13], picolines[13], plication[13], epinastic[13], pianistic[13], sincipita[13], cisplatin[13], opacities[13], scapolite[13], pisolitic[13], opticians[13], conepatls[13], apostolic[13], politicos[13], anglicise[12], laicising[12], gasolinic[12], logicians[12], pignolias[12], apologies[12], apologise[12], genitalic[12], eliciting[12], etiologic[12], epilating[12], clingiest[12], agonistic[12], octangles[12], gnostical[12], nostalgic[12], closeting[12], ecologist[12], plaitings[12], pilotages[12], poetising[12], gantlopes[12], pilotings[12], pistoling[12], apologist[12], polonaise[11], ciliation[11], coalition[11], coitional[11], epilation[11], italicise[11], inelastic[11], sciential[11], socialite[11], coastline[11], sectional[11], isooctane[11], locations[11], colonitis[11], antipoles[11], nopalitos[11], optionals[11], postilion[11], agilities[10], gainliest[10], gelations[10], legations[10], intaglios[10], isolating[10], ligations[10], enologist[10], neologist[10], anilities[9], isolation[9]

8 letter words

epigonic[13], policing[13], geoponic[13], pelagics[13], escaping[13], piecings[13], clasping[13], scalping[13], splicing[13], scooping[13], coapting[13], picoting[13], coopting[13], picoline[12], piscinae[12], capelins[12], panicles[12], pelicans[12], piscinal[12], penicils[12], policies[12], canopies[12], pinocles[12], cipolins[12], picolins[12], psilocin[12], platinic[12], poetical[12], optician[12], conepatl[12], platonic[12], leptonic[12], politico[12], logician[11], neologic[11], pignolia[11], ceilings[11], logicise[11], coinages[11], isogenic[11], congeals[11], solacing[11], isogonic[11], colognes[11], elapsing[11], pleasing[11], speiling[11], spieling[11], spoilage[11], pignolis[11], spoiling[11], pogonias[11], spooling[11], cleating[11], lignitic[11], octangle[11], locating[11], pleating[11], plaiting[11], pilotage[11], opiating[11], gantlope[11], piloting[11], gestical[11], castling[11], catlings[11], salicine[10], isocline[10], silicone[10], colonies[10], colonise[10], eclosion[10], opalines[10], ecotonal[10], location[10], antipole[10], nopalito[10], optional[10], ciliates[10], silicate[10], canities[10], isatinic[10], canistel[10], liaising[9], gasoline[9], isogonal[9], gelation[9], legation[9], intaglio[9], ligation[9], gelatins[9], genitals[9], stealing[9], taglines[9], alienist[8]