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7 letter words:

proviso12,

6 letter words:

pooris8,

5 letter words:

visor8, poori7, proso7, sopor7, spoor7,

4 letter words:

spiv9, oops6, piso6, pois6, poor6, poos6, pros6, rips6, sori4,

3 letter words:

vis6, ops5, pis5, poi5, poo5, pro5, psi5, rip5, sip5, sop5, ors3, sir3, sri3,

2 letter words:

op4, pi4, is2, oi2, or2, os2, si2, so2,