use '?' for JOKER (blank)

From letters G, R, A, N, D, P, A, R, E, N, T, H, O, O, D  I made following words

15 letter words

grandparenthood[23]

11 letter words

arthropodan[17], grandparent[15]

10 letter words

dragonhead[16], parenthood[16], orthograde[15], prorogated[14], pteranodon[13]

9 letter words

orphanage[15], harpooned[15], pronghorn[15], arthropod[15], harpooner[14], paragoned[13], pendragon[13], gonorrhea[13], godparent[13], nongraded[12], dragooned[12], gadrooned[12], trapanned[12], patronage[12], prorogate[12], deodorant[11], regardant[11], arrogated[11]

8 letter words

drophead[15], odograph[15], orphaned[14], phonated[14], heptagon[14], pathogen[14], theropod[14], dognaped[13], hangared[13], pantheon[13], goatherd[13], thronged[13], honorand[12], pardoned[12], dognaper[12], dragrope[12], prograde[12], portaged[12], pardoner[11], parergon[11], pentagon[11], poontang[11], gradated[11], pregnant[11], tapadero[11], pronated[11], tragopan[11], northern[11], parroted[11], predator[11], prorated[11], protrade[11], teardrop[11], trapdoor[11], androgen[10], arranged[10], dragonet[10], garroted[10], operator[10], pronator[10], nonrated[9], negatron[9], ratooned[9], narrated[9], arrogate[9], arrogant[9], tarragon[9], toreador[9], ratooner[8]

7 letter words

graphed[14], godhead[13], hardpan[13], pothead[13], hoptoad[13], photoed[13], hardtop[13], hoarded[12], hagrode[12], hanaper[12], anaphor[12], nephron[12], harpoon[12], thonged[12], phaeton[12], phonate[12], panther[12], phorate[12], deadpan[11], endopod[11], honored[11], paraded[11], grandpa[11], pranged[11], podagra[11], pronged[11], drooped[11], hoarder[11], rhodora[11], prodder[11], thanage[11], adapted[11], adopted[11], thorned[11], throned[11], agoroth[11], noodged[10], apogean[10], grandad[10], nonhero[10], pandora[10], aproned[10], operand[10], padrone[10], pandore[10], paragon[10], pandoor[10], honorer[10], parader[10], parerga[10], pardner[10], parador[10], eardrop[10], pageant[10], pendant[10], notepad[10], another[10], adapter[10], readapt[10], trepang[10], adaptor[10], adopter[10], readopt[10], portage[10], portend[10], protend[10], torpedo[10], trooped[10], horrent[10], norther[10], deodara[9], adorned[9], groaned[9], dendron[9], donnerd[9], dragoon[9], gadroon[9], prenoon[9], gnarred[9], grander[9], donated[9], tangoed[9], gradate[9], gardant[9], dragnet[9], granted[9], garoted[9], trodden[9], operant[9], pronate[9], protean[9], patroon[9], pronota[9], partner[9], praetor[9], prorate[9], trooper[9], oregano[8], organon[8], arrange[8], adorner[8], readorn[8], groaner[8], andante[8], tannage[8], negaton[8], tonnage[8], odonate[8], tanager[8], regnant[8], negator[8], donnert[8], rontgen[8], rootage[8], donator[8], odorant[8], tandoor[8], tornado[8], granter[8], regrant[8], garrote[8], grantor[8], redroot[8], narrate[7], aerator[7]