use '?' for JOKER (blank)

From letters C, O, U, N, T, E, R, S, T, R, I, K, E, S  I made following words

14 letter words

counterstrikes[20]

13 letter words

counterstrike[19]

12 letter words

intercourses[14]

11 letter words

intercessor[13], intercourse[13], scrutineers[13], instructors[13]

10 letter words

snickerers[16], restricken[16], rocketries[16], stockinets[16], tricksters[16], trinketers[14], strikeouts[14], tiercerons[12], resections[12], secretions[12], corsetries[12], intercross[12], intersects[12], contesters[12], cornetists[12], trisectors[12], coinsurers[12], recursions[12], scrutineer[12], recounters[12], courtesies[12], construers[12], instructor[12], cotrustees[12], strictures[12]

9 letter words

snickerer[15], rockeries[15], reckoners[15], sickeners[15], corkiness[15], rockiness[15], rocketers[15], stockinet[15], trickster[15], stockiest[15], outtricks[15], stickouts[15], kerosines[13], tinkerers[13], stenokies[13], instrokes[13], restrikes[13], trinketer[13], keiretsus[13], turkoises[13], sunstroke[13], strikeout[13], outskirts[13], recession[11], sorceries[11], recensors[11], resorcins[11], tierceron[11], erections[11], neoterics[11], resection[11], secretion[11], rectories[11], tricornes[11], seicentos[11], secretins[11], sincerest[11], crosstree[11], secretors[11], intersect[11], contester[11], trecentos[11], cornetist[11], trisector[11], centrists[11], restricts[11], cinereous[11], coinsurer[11], recursion[11], sinecures[11], sericeous[11], coinsures[11], censurers[11], recourses[11], resources[11], recounter[11], ceintures[11], centuries[11], enuretics[11], countries[11], cretinous[11], neurotics[11], courtiers[11], construer[11], trouncers[11], cerusites[11], cerussite[11], curtesies[11], icteruses[11], construes[11], intercuts[11], tinctures[11], cotrustee[11], toreutics[11], stricture[11], cutesiest[11], crustiest[11], instructs[11], orienters[9], orneriest[9], reorients[9], serotines[9], inserters[9], reinserts[9], tenorites[9], noisettes[9], teosintes[9], insetters[9], interests[9], sternites[9], triteness[9], tenorists[9], nurseries[9], reinsures[9], reuniters[9], turneries[9], unretires[9], retrousse[9], snoutiest[9], sostenuti[9], tessiture[9], utterness[9], ruttiness[9], outsteers[9]

8 letter words

reckoner[14], sickener[14], snickers[14], rocketer[14], neckties[14], stricken[14], corkiest[14], rockiest[14], stockier[14], trickers[14], stickers[14], restocks[14], kerosine[12], skerries[12], tinkerer[12], kernites[12], instroke[12], restrike[12], keisters[12], kiesters[12], stinkers[12], sincerer[10], recensor[10], resorcin[10], senecios[10], necroses[10], necrosis[10], rescores[10], crosiers[10], scorners[10], erection[10], neoteric[10], tricorne[10], seicento[10], enterics[10], enticers[10], secretin[10], coteries[10], esoteric[10], cointers[10], corniest[10], noticers[10], reciters[10], erectors[10], secretor[10], tricorns[10], centesis[10], coesites[10], sections[10], cisterns[10], crosstie[10], roseries[8], orienter[8], reorient[8], oneriest[8], serotine[8], inserter[8], reinsert[8], reinters[8], rentiers[8], terrines[8], introrse[8], essonite[8], sentries[8]