7 letter words:
upfills12,
6 letter words:
upfill11,
5 letter words:
flips10,
fills8,
fulls8,
fusil8,
pills7,
pilus7,
pulis7,
pulli7,
pulls7,
spill7,
4 letter words:
flip9,
pfui9,
spif9,
fill7,
fils7,
flus7,
full7,
lips6,
lisp6,
pill6,
plus6,
puli6,
pull6,
puls6,
slip6,
ills4,
sill4,
3 letter words:
fil6,
flu6,
ifs6,
sif6,
lip5,
pis5,
piu5,
plu5,
psi5,
pul5,
pus5,
sip5,
sup5,
ups5,
ill3,
lis3,
sui3,
2 letter words:
if5,
pi4,
up4,
is2,
li2,
si2,
us2,