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7 letter words:

lustrum9,

5 letter words:

murls7, strum7, stulm7, turms7,

4 letter words:

lums6, murl6, must6, muts6, rums6, slum6, smur6, smut6, stum6, tums6, turm6, lurs4, lust4, rust4, ruts4, slur4, slut4, sulu4, ulus4, urus4, utus4,

3 letter words:

lum5, mus5, mut5, rum5, sum5, tum5, umu5, lur3, rut3, sur3, ulu3, uts3, utu3,

2 letter words:

mu4, um4, st2, ur2, us2, ut2,