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5 letter words:

yucky17,

4 letter words:

yuky14, yuck13, puck12, ruck10,

3 letter words:

cuz14, kyu10, yuk10, cry8, pry8, puy8, yup8, cup7, cru5, cur5, pur5, ruc5, urp5,

2 letter words:

ky9, yu5, up4, ur2,