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From letters S, A, N, D, W, O, R, M  I made following words

8 letter words

sandworm[14], swordman[14]

7 letter words

onwards[11], randoms[10], rodsman[10]

6 letter words

womans[11], onward[10], drowns[10], random[9], rodman[9], damson[9], monads[9], nomads[9], rowans[9], manors[8], ramson[8], ransom[8], romans[8], adorns[7], andros[7], radons[7]

5 letter words

woman[10], swarm[10], warms[10], worms[10], adown[9], drawn[9], drown[9], dawns[9], wands[9], woads[9], downs[9], draws[9], sward[9], wards[9], sword[9], words[9], monad[8], nomad[8], damns[8], drams[8], dorms[8], rowan[8], warns[8], sowar[8], sworn[8], manor[7], roman[7], manos[7], mason[7], moans[7], monas[7], nomas[7], soman[7], moras[7], roams[7], morns[7], norms[7], adorn[6], andro[6], radon[6], donas[6], darns[6], nards[6], rands[6], dorsa[6], roads[6], sarod[6], arson[5], roans[5], sonar[5]

4 letter words

mawn[9], mown[9], warm[9], worm[9], maws[9], swam[9], mows[9], dawn[8], wand[8], woad[8], down[8], draw[8], ward[8], word[8], daws[8], wads[8], dows[8], damn[7], dram[7], dorm[7], dams[7], mads[7], doms[7], mods[7], warn[7], worn[7], awns[7], sawn[7], snaw[7], swan[7], wans[7], nows[7], owns[7], snow[7], sown[7], wons[7], raws[7], wars[7], rows[7], mano[6], moan[6], noma[6], mora[6], roam[6], morn[6], norm[6], mans[6], moas[6], soma[6], mons[6], noms[6], arms[6], mars[6], rams[6], mors[6], roms[6], dona[5], darn[5], nard[5], rand[5], orad[5], road[5], ands[5], dans[5], sand[5], ados[5], odas[5], soda[5], dons[5], nods[5], rads[5], sard[5], dors[5], rods[5], sord[5], roan[4], naos[4], oars[4], osar[4], soar[4], sora[4], sorn[4]

3 letter words

maw[8], daw[7], wad[7], dam[6], mad[6], dom[6], mod[6], awn[6], naw[6], man[5], nam[5], moa[5], mon[5], nom[5], arm[5], mar[5], ram[5], mor[5], rom[5], mas[5], mos[5], oms[5], som[5], and[4], dan[4], ado[4], oda[4], don[4], nod[4], rad[4], dor[4], rod[4], ads[4], sad[4], dos[4], ods[4], sod[4], ran[3], oar[3], ora[3], nor[3], nos[3], ons[3], son[3], ars[3], ras[3], ors[3]