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6 letter words:

porous8,

5 letter words:

pours7, proso7, roups7, sopor7, spoor7,

4 letter words:

oops6, opus6, poor6, poos6, pour6, pros6, purs6, roup6, soup6, spur6, urps6, ours4, sour4,

3 letter words:

ops5, poo5, pro5, pur5, pus5, sop5, sup5, upo5, ups5, urp5, ors3, our3, sou3,

2 letter words:

op4, up4, or2, os2, so2, us2,