You can only change ONE letter, AND/OR rearrange the letters currently available. The first word is:
WINS
past
mast
must
mist
list
silt
salt
stall
Five letters?! Must be a difficult day Lol!
tall
toll
boll
bolt
lots
lobs
lobe
blob
slob
lops
pops
oops
soon
nose
eons
sore