use '?' for JOKER (blank)

From letters Y, E, L, L, O, W, H, A, M, M, E, R  I made following words

12 letter words

yellowhammer[25]

9 letter words

wholemeal[17]

8 letter words

mealworm[15], hallower[14], yellower[14], mellower[13]

7 letter words

wommera[14], myeloma[14], hellery[13], walleye[13], rollway[13], armhole[12], eelworm[12], morally[12], loyaler[10], morelle[9]

6 letter words

whammy[19], haymow[17], whammo[16], mayhem[16], wholly[15], homely[14], warmly[14], hammer[13], hemmer[13], yammer[13], memory[13], hallow[12], whaler[12], howler[12], leeway[12], yellow[12], lawyer[12], lowery[12], yowler[12], mollah[11], hareem[11], hermae[11], mallow[11], mellow[11], mewler[11], womera[11], lamely[11], merely[11], healer[9], heller[9], holler[9], rallye[9], really[9], yeller[9], orally[9], mallee[8], morale[8], areole[6], loreal[6]

5 letter words

hammy[15], whelm[13], whamo[13], homey[13], rhyme[13], wormy[13], mamey[12], malmy[12], myoma[12], rammy[12], whale[11], wheal[11], wheel[11], whole[11], hewer[11], where[11], whore[11], whorl[11], holey[11], hoyle[11], holly[11], hayer[11], hoary[11], wally[11], welly[11], lowly[11], weary[11], rawly[11], almeh[10], hemal[10], mahoe[10], mohel[10], harem[10], herma[10], rehem[10], rheme[10], homer[10], mower[10], mealy[10], loamy[10], molly[10], emery[10], marly[10], mylar[10], mayor[10], moray[10], lemma[9], emmer[9], haole[8], hallo[8], holla[8], hello[8], haler[8], horal[8], allow[8], waler[8], lower[8], rowel[8], alley[8], alloy[8], loyal[8], early[8], layer[8], leary[8], relay[8], leery[8], rally[8], royal[8], amole[7], molal[7], ameer[7], ramee[7], lamer[7], realm[7], merle[7], morae[7], molar[7], moral[7], morel[7], allee[5], laree[5], loral[5]

4 letter words

ahem[9], haem[9], hame[9], heme[9], halm[9], helm[9], home[9], holm[9], harm[9], herm[9], meme[8], malm[8], ammo[8], memo[8], mome[8], hale[7], heal[7], heel[7], hall[7], hell[7], halo[7], helo[7], hole[7], hare[7], hear[7], rhea[7], here[7], harl[7], herl[7], lehr[7], hoar[7], hora[7], hero[7], hoer[7], alme[6], lame[6], male[6], meal[6], mall[6], mell[6], loam[6], mola[6], mole[6], moll[6], mare[6], ream[6], mere[6], marl[6], merl[6], alee[4], leal[4], aloe[4], olea[4], olla[4], earl[4], lear[4], rale[4], real[4], leer[4], reel[4], aero[4], oral[4], lore[4]