use '?' for JOKER (blank)

From letters B, I, O, S, T, R, A, T, I, G, R, A, P, H, Y  I made following words

15 letter words

biostratigraphy[26]

12 letter words

stratigraphy[21]

10 letter words

barographs[18]

9 letter words

biography[20], barograph[17], hairspray[17], prohibits[16], hygrostat[16], baptistry[16], trigraphs[15], spirogyra[15], thyristor[15], atrophias[14], apriority[14], sagittary[13], arthritis[12], aspirator[11], abattoirs[11], parotitis[11], portraits[11], agitators[10]

8 letter words

prohibit[15], isograph[14], trigraph[14], atrophia[13], pigboats[13], hospitia[13], parashot[13], aphorist[13], habitats[13], brattish[13], priority[13], portrays[13], botrytis[13], pyrostat[13], baptisia[12], airtight[12], straight[12], rightist[12], gyrators[12], gyrostat[12], artistry[11], airboats[10], apiarist[10], arborist[10], airstrip[10], airports[10], abattoir[10], portrait[10], partitas[10], patriots[10], rattraps[10], rigorist[9], agitator[9], sartorii[8], traitors[8]

7 letter words

bypaths[17], atrophy[15], phratry[15], phobias[14], barhops[14], grayish[14], biparty[14], probity[14], piroghi[13], brights[13], spright[13], bigotry[13], ashtray[13], history[13], throaty[13], thirsty[13], boarish[12], pariahs[12], raphias[12], airship[12], harbors[12], pigboat[12], bothria[12], isobath[12], postbag[12], harpist[12], habitat[12], pirayas[12], topiary[12], parroty[12], portray[12], pitayas[12], piosity[12], barytas[12], satrapy[12], attaboy[12], gharris[11], goatish[11], tigrish[11], probits[11], baptist[11], gyrator[11], airbags[10], ratbags[10], bogarts[10], airshot[10], shortia[10], thorias[10], ragtops[10], athirst[10], rattish[10], tartish[10], throats[10], ostiary[10], yttrias[10], abrosia[9], aporias[9], arrobas[9], rasbora[9], barrios[9], airboat[9], airport[9], barista[9], abators[9], rabatos[9], airpost[9], parrots[9], raptors[9], partita[9], patriot[9], rattrap[9], tripart[9], abattis[9], bistort[9], protist[9], orgiast[8], agitato[8], rosaria[7], traitor[7], striata[7], tartars[7]

6 letter words

phobia[13], barhop[13], bishop[13], graphs[12], bright[12], bights[12], pariah[11], raphia[11], harbor[11], poisha[11], abhors[11], parish[11], raphis[11], pharos[11], habits[11], bathos[11], pathos[11], potash[11], aarrgh[10], gharri[10], garish[10], ogrish[10], aright[10], righto[10], probit[10], aghast[10], airbag[9], pirogi[9], biogas[9], sharia[9], orisha[9], pargos[9], sirrah[9], ratbag[9], bogart[9], thoria[9], ragtop[9], bigots[9], aporia[8], arriba[8], arroba[8], barrio[8], isobar[8], oribis[8], briars[8], arbors[8], priors[8], abator[8], rabato[8], parrot[8], raptor[8], abatis[8], tibias[8], biotas[8], sapota[8], patios[8], patois[8], agrias[7], agoras[7], rigors[7], agitas[7], taigas[7], ariosi[6]