use '?' for JOKER (blank)

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

15 letter words

weatherproofing[27]

13 letter words

waterproofing[22]

12 letter words

weatherproof[23]

11 letter words

perforating[17], perforation[16], reoperating[14], reoperation[13]

10 letter words

wharfinger[20], pinfeather[18], waterproof[18], feathering[17], foregather[17], weathering[17], preheating[16], repowering[16], fortepiano[15], pianoforte[15], perorating[13], progenitor[13], peroration[12]

9 letter words

pregrowth[18], heatproof[17], hoofprint[17], firepower[17], wearproof[17], wirephoto[17], fathering[16], freighter[16], forgather[16], farrowing[16], harrowing[16], nightwear[16], wreathing[16], growthier[16], pathogene[15], photogene[15], threaping[15], threeping[15], frontpage[15], pothering[15], firethorn[15], whereinto[15], firewater[15], poriferan[14], aerophore[14], harpooner[14], rainproof[14], perforate[14], profiteer[14], rehearing[13], foreigner[13], gonorrhea[13], reroofing[13], reheating[13], ferreting[13], rewearing[13], operagoer[12], repeating[12], operating[12], rotiferan[12], porterage[12], reportage[12], parroting[12], prorating[12], portering[12], reporting[12], prorogate[12], peritonea[11], operation[11], pretorian[11], proration[11], portioner[11], orangerie[10], retearing[10], generator[10]

8 letter words

whoofing[18], wharfing[18], prefight[17], wheeping[17], whooping[17], preweigh[17], giftwrap[17], wetproof[16], hangfire[15], farthing[15], frighten[15], frothing[15], wafering[15], forewing[15], giftware[15], weighter[15], thrawing[15], wrathing[15], ingrowth[15], throwing[15], worthing[15], regrowth[15], geophone[14], proofing[14], heptagon[14], pathogen[14], photoing[14], graphite[14], therefor[14], frothier[14], trigraph[14], powering[14], forewarn[14], foreworn[14], waterhen[14], wreathen[14], whitener[14], forewent[14], footwear[14], honewort[14], wreather[14], wrathier[14], witherer[14], worthier[14], hornwort[14], earphone[13], pinafore[13], profaner[13], airproof[13], perianth[13], nephrite[13], trephine[13], ephorate[13], threaper[13], firetrap[13], forepart[13], profiter[13], airpower[13], foregone[12], ferriage[12], fingerer[12], fairgoer[12], foregoer[12], figeater[12], heritage[12], earthing[12], hearting[12], ingather[12], frontage[12], footgear[12], gatherer[12], regather[12], arrowing[12], twangier[12], watering[12], towering[12], perigean[11], peregrin[11], progeria[11], parergon[11], herniate[11], antihero[11], hereinto[11], retaping[11], tapering[11], petering[11], trooping[11], earthier[11], heartier[11], frontier[11], thornier[11], rooftree[11], ironware[11], waterier[11], interwar[11], winterer[11], towerier[11], interrow[11], optionee[10], aperient[10], atropine[10], pretrain[10], terrapin[10], perorate[10], priorate[10], portiere[10], operator[10], pronator[10], regainer[9], orangier[9], erigeron[9], gratinee[9], interage[9], rogation[9], retainer[8], anterior[8], orienter[8], reorient[8], ratooner[8]

7 letter words

hoofing[14], heaping[13], epigean[10], peonage[10], epigone[10], pogonia[10]