use '?' for JOKER (blank)

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

14 letter words

weatherproofed[26]

12 letter words

weatherproof[23], waterproofed[21]

10 letter words

waterproof[18], heretofore[16], perforated[16], reoperated[13]

9 letter words

wherefore[18], heatproof[17], wearproof[17], feathered[16], weathered[16], heartwood[16], afterword[16], proofread[15], preheated[15], heartfree[15], hereafter[15], therefore[15], arthropod[15], repowered[15], deepwater[15], freewrote[15], aerophore[14], preheater[14], perforate[14], federator[13], dewaterer[13], perorated[12], reoperate[11]

8 letter words

wetproof[16], forehead[15], fathered[15], farrowed[15], harrowed[15], foreword[15], wreathed[15], predeath[14], threaped[14], threeped[14], pothered[14], theropod[14], therefor[14], predraft[14], pearwood[14], freeware[14], powderer[14], footwear[14], wreather[14], dropwort[14], ephorate[13], threaper[13], forepart[13], pewterer[13], reroofed[12], defeater[12], federate[12], redefeat[12], reheated[12], foredate[12], raftered[12], ferreted[12], rethread[12], threader[12], departee[11], repeated[11], operated[11], deportee[11], reheater[11], rooftree[11], parroted[11], predator[11], prorated[11], protrade[11], teardrop[11], deporter[11], portered[11], reported[11], trapdoor[11], repartee[10], repeater[10], rerepeat[10], perorate[10], operator[10], toreador[9]

7 letter words

whoofed[17], wharfed[17], wheeped[16], whooped[16], whereof[16], pooftah[15], whoopee[15], forepaw[15], whooper[15], frothed[14], wafered[14], dwarfer[14], forward[14], froward[14], towhead[14], fatwood[14], thrawed[14], wrathed[14], worthed[14], prefade[13], ephedra[13], proofed[13], pothead[13], footpad[13], hoptoad[13], photoed[13], feather[13], terefah[13], thereof[13], hardtop[13], farther[13], frother[13], powered[13], weather[13], whereat[13], wreathe[13], whereto[13], thrower[13], proofer[12], reproof[12], preheat[12], phorate[12], foretop[12], poofter[12], repower[12], towrope[12], rewrapt[12], adherer[11], reheard[11], hoarder[11], rhodora[11], draftee[11], earthed[11], hearted[11], drafter[11], redraft[11], redware[11], arrowed[11], dewater[11], tarweed[11], watered[11], towered[11], eardrop[10], adoptee[10], adepter[10], predate[10], retaped[10], tapered[10], petered[10], adopter[10], readopt[10], torpedo[10], trooped[10], ferrate[10], waterer[10], rewrote[10], operate[9], pearter[9], taperer[9], praetor[9], prorate[9], trooper[9], retread[8], treader[8], redroot[8]

6 letter words

hoofed[13], heaped[12], hooped[12], poohed[12], hereof[12], hoofer[12], harped[12], heaper[11], hooper[11], deafer[10], feared[10], feeder[10], reefed[10], refeed[10], adhere[10], header[10], heeder[10], fedora[10], foredo[10], roofed[10], dhoora[10], pardee[9], reaped[9], deeper[9], peered[9], roadeo[7], dearer[7], reader[7], reared[7], redear[7]