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From letters B, I, O, G, E, O, G, R, A, P, H, I, C, A, L  I made following words

15 letter words

biogeographical[26]

13 letter words

biogeographic[24]

12 letter words

biographical[22], geographical[21]

11 letter words

agoraphobic[21], logographic[20], archipelago[19], prebiologic[18]

10 letter words

biographic[20], geographic[19], acrophobia[19], agoraphobe[18], hagiologic[17]

9 letter words

poachable[18], acrophobe[18], coliphage[17], graphical[17], bolograph[17], geophagia[16], eparchial[16], parochial[16], logograph[16], logogriph[16], rheologic[15], parabolic[15], oleograph[15], algebraic[14], bricolage[14], georgical[13], agrologic[13], apologiae[12], aerologic[12]

8 letter words

philabeg[16], philibeg[16], agraphic[16], brachial[15], bachelor[15], parhelic[15], poachier[15], orphical[15], galabieh[14], apagogic[14], epibolic[14], oligarch[14], capabler[14], biologic[13], heroical[13], parhelia[13], geologic[12], alopecia[12], biracial[12], albacore[12], braciola[12], albicore[12], braciole[12], cabriole[12], cloggier[12], paragoge[12], capoeira[12], arpeggio[12], capriole[12], apologia[11]

7 letter words

biochip[16], pibroch[16], graphic[15], chaebol[14], acaleph[14], epochal[14], brachia[14], chigger[14], abroach[14], brioche[14], charpai[14], haircap[14], poacher[14], capable[13], copaiba[13], placebo[13], begorah[13], choragi[13], choregi[13], piroghi[13], acholia[12], agapeic[12], pelagic[12], aphelia[12], apogeic[12], haggler[12], achiral[12], rachial[12], hirable[12], charlie[12], higgler[12], cholera[12], chorale[12], choreal[12], chorial[12], harelip[12], ephoral[12], apagoge[11], garbage[11], baggier[11], caliber[11], calibre[11], gharial[11], aerobic[11], boggier[11], georgic[11], ciboria[11], blogger[11], boggler[11], clogger[11], bricole[11], corbeil[11], bicolor[11], brocoli[11], piggier[11], parable[11], carpale[11], caliper[11], replica[11], caporal[11], crapola[11], ropable[11], bipolar[11], parboil[11], preboil[11], peloric[11], policer[11], carpool[11], blooper[11], precool[11], abigail[10], apogeal[10], algebra[10], glacier[10], gracile[10], bilgier[10], garboil[10], obliger[10], airhole[10], obligor[10], pierogi[10], pergola[10], goopier[10], aerobia[9], acerola[9], calorie[9], cariole[9], coalier[9], loricae[9], loggier[9], peloria[9], liriope[9], loopier[9], regalia[8]

6 letter words

phobic[15], bleach[13], apache[13], chapel[13], pleach[13], caliph[13], cheapo[13], phobia[13], ghibli[12], chigoe[12], biopic[12], haggle[11], habile[11], heliac[11], higgle[11], beclog[11], lochia[11], gelcap[11], baggie[10], biggie[10], hoagie[10], boggle[10], colobi[10], piggie[10], palace[10], apical[10], epical[10], plaice[10], plicae[10], oblige[9], boogie[9], hoolie[9], abelia[8], aecial[8], bailie[8], galago[8], obelia[8], loggia[8], loggie[8], blooie[8], coolie[8], gigolo[8], laogai[7], goalie[7]