You can only change ONE letter, AND/OR rearrange the letters currently available. The first word is:
WINS
oats
hats
hams
mash
slam
lamp
plum
glum
glue
glut
lout
loud
dull
dill
wild
wail
wall
ally
slay
ways
Happy Birthday for Tuesday, Michael! I will be away, so I'll send my wishes now.
sway
swag
jaws
jabs