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8 letter words:

billyboy18,

6 letter words:

billyo11,

5 letter words:

bilby12, lobby12, billy10, bilbo9,

4 letter words:

blob8, illy7, lily7, oily7, yill7, bill6, boil6, boll6, lobi6, lilo4,

3 letter words:

boy8, yob8, bib7, bob7, loy6, bio5, boi5, lib5, lob5, obi5, ill3, oil3,

2 letter words:

by7, oy5, yo5, bi4, bo4, ob4, io2, li2, lo2, oi2,