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6 letter words:

clumpy15,

5 letter words:

lumpy12, plumy12, clump11,

4 letter words:

puny9, culm8, lump8, plum8, luny7,

3 letter words:

myc10, ply8, yum8, yup8, cum7, cup7, ump7, lum5, mun5, pul5, pun5,

2 letter words:

my7, mu4, um4, up4, nu2, un2,