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5 letter words:

nidus6, nisus5, sinus5,

4 letter words:

dins5, diss5, duns5, nidi5, suds5, nisi4, sins4, suns4,

3 letter words:

din4, dis4, dui4, dun4, ids4, ins3, nus3, sin3, sis3, sun3, uns3,

2 letter words:

id3, in2, is2, nu2, si2, un2, us2,