use '?' for JOKER (blank)

From letters O, V, E, R, S, E, R, V, I, C, I, N, G  I made following words

13 letter words

overservicing[22]

11 letter words

reservicing[17]

10 letter words

recovering[16], viverrines[16]

9 letter words

receiving[15], revoicing[15], scrieving[15], servicing[15], converges[15], coverings[15], viverrine[15], inversive[15], coversine[14], scrivener[14], conserver[14], converser[14], sovereign[13], reserving[13], reversing[13], isogeneic[12], congeries[12], recognise[12], groceries[12], rescoring[12], reversion[12], erigerons[10]

8 letter words

evincive[16], reviving[15], converge[14], covering[14], voicings[14], scriving[14], revivers[14], overnice[13], invoices[13], revoices[13], conserve[13], converse[13], servicer[13], coverers[13], recovers[13], revering[12], severing[12], revising[12], visoring[12], grievers[12], erogenic[11], isogenic[11], generics[11], coreigns[11], cosigner[11], cringers[11], riverine[11], vineries[11], eversion[11], revision[11], rivieres[11], verniers[11], recision[10], soricine[10], sincerer[10], recensor[10], resorcin[10], erigeron[9], eringoes[9], seignior[9], resigner[9], rerising[9], ignorers[9]

7 letter words

civvies[15], revving[14], voicing[13], covings[13], reviver[13], revives[13], invoice[12], cervine[12], revoice[12], corvine[12], coverer[12], recover[12], evinces[12], novices[12], scrieve[12], service[12], corvees[12], voicers[12], reeving[11], regiven[11], veering[11], reiving[11], overing[11], griever[11], sieving[11], viseing[11], grieves[11], regives[11], serving[11], versing[11], virgins[11], isogriv[11], governs[11], rovings[11], vergers[11], generic[10], coreign[10], cringer[10], congees[10], cognise[10], coignes[10], cringes[10], congers[10], scoring[10], grocers[10], veinier[10], riviere[10], nervier[10], vernier[10], enviers[10], inverse[10], veiners[10], venires[10], versine[10], erosive[10], ivories[10], enviros[10], renvois[10], version[10], virions[10], reivers[10], reviser[10], rievers[10], reverso[10], revisor[10], eirenic[9], oneiric[9], cornier[9], senecio[9], eosinic[9], nicoise[9], sincere[9], irenics[9], sericin[9], encores[9], necrose[9], coiners[9], cronies[9], orceins[9], recoins[9], incisor[9], rescore[9], cirrose[9], corries[9], crosier[9], orrices[9], corners[9], scorner[9], ignorer[8], genoise[8], soignee[8], greisen[8], eringos[8], ignores[8], regions[8], signore[8], origins[8], signior[8], signori[8], ringers[8], gorsier[8], onerier[7], ironies[7], noisier[7], rerisen[7], ironers[7]

6 letter words

congee[9], coigne[9], congii[9], cering[9], cringe[9], ricing[9], conger[9], coring[9], grocer[9], irenic[8], encore[8], coiner[8], orcein[8], recoin[8], ironic[8], corrie[8], orrice[8], corner[8], eringo[7], ignore[7], region[7], origin[7], erring[7], ringer[7], gorier[7]