6 letter words:
situps8,
5 letter words:
situp7,
spits7,
situs5,
suits5,
4 letter words:
piss6,
pits6,
psis6,
psst6,
ptui6,
puss6,
puts6,
sips6,
spit6,
sups6,
tips6,
tups6,
sits4,
suit4,
tuis4,
3 letter words:
pis5,
pit5,
piu5,
psi5,
pst5,
pus5,
put5,
sip5,
sup5,
tip5,
tup5,
ups5,
its3,
sis3,
sit3,
tis3,
tui3,
uts3,
2 letter words:
pi4,
up4,
is2,
it2,
si2,
ti2,
us2,
ut2,