use '?' for JOKER (blank)

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

15 letter words

prognosticating[21]

12 letter words

constipating[17], conspiration[16], constipation[16], contraptions[16]

11 letter words

picarooning[16], gongoristic[15], anisotropic[15], contraption[15], cartoonings[14], patronising[14], protonating[14], cogitations[14], contrasting[14], protagonist[14], nonartistic[13], contritions[13], antiprotons[13]

10 letter words

conspiring[15], incorpsing[15], captioning[15], practising[15], prognostic[15], prognosing[14], ascription[14], proactions[14], cogitating[14], cartooning[13], coronating[13], portioning[13], incognitas[13], sonicating[13], cognations[13], contagions[13], cognitions[13], incognitos[13], organicist[13], consorting[13], incogitant[13], cogitation[13], corotating[13], contorting[13], astricting[13], cogitators[13], organising[12], gorgonians[12], sonication[12], astringing[12], pronations[12], contrition[12], antiproton[12], nictations[12], constraint[12], cartoonist[12], partitions[12], rattooning[11], stationing[11], intrigants[11], transiting[11], instigator[11], nitrations[10], transition[10]

9 letter words

scrooping[14], scripting[14], cognising[13], cosigning[13], springing[13], picaroons[13], portaging[13], proaction[13], inotropic[13], opticians[13], psoriatic[13], isotropic[13], copatrons[13], corposant[13], parotitic[13], patriotic[13], patristic[13], prostatic[13], proctitis[13], protistic[13], tropistic[13], inorganic[12], poisoning[12], consignor[12], spraining[12], prisoning[12], incognita[12], cognation[12], contagion[12], cognition[12], incognito[12], optioning[12], cartoning[12], nontragic[12], pronating[12], agonistic[12], paintings[12], poontangs[12], orgiastic[12], traipsing[12], printings[12], sprinting[12], pastoring[12], riposting[12], nictating[12], cottoning[12], cogitator[12], gastritic[12], gorgonian[11], agonising[11], sopranino[11], pronation[11], inactions[11], onanistic[11], conations[11], stringing[11], constrain[11], transonic[11], consortia[11], sonicator[11], nonactors[11], troponins[11], nictation[11], garotting[11], partition[11], incitants[11], citations[11], nonstatic[11], potations[11], tractions[11], striction[11], parotitis[11], protistan[11], signorina[10], arointing[10], rationing[10], ratooning[10], straining[10], trainings[10], rigatonis[10], ignitrons[10], rogations[10], intrigant[10], nitrating[10], attorning[10], intorting[10], instating[10], striating[10], nitration[9], notations[9], striation[9], nonartist[9], strontian[9], rotations[9], sortition[9]

8 letter words

prancing[13], scooping[13], carpings[13], scarping[13], scraping[13], crisping[13], incaging[12], congaing[12], coigning[12], cringing[12], pranging[12], pronging[12], picaroon[12], isagogic[12], sponging[12], grasping[12], pargings[12], sparging[12], parsonic[12], crooning[11], aproning[11], incasing[11], isogonic[11], pogonias[11], snooping[11], spooning[11], organics[11], crannogs[11], scorning[11], gracioso[11], aspiring[11], pairings[11], praising[11], graining[10], groaning[10], groining[10], ignoring[10], opinions[10], ingrains[9], ironings[9], nigrosin[9], rosining[9], organons[9]