calm.
palm 
slum.
slam 
You had to change two letters to get from “palm” to “slum.”
Playing off “palm”:
plan
Good gravy, I’m dumb. Thank you for correcting me.
Lamp 
meal 
real 
read 
dead 
daze 
maze 
make 
fake
cake 
take 
sake 
seam 
mace.
acme 
calm.
palm 
slum.
slam 
You had to change two letters to get from “palm” to “slum.”
Playing off “palm”:
plan
Good gravy, I’m dumb. Thank you for correcting me.
Lamp 
meal 
real 
read 
dead 
daze 
maze 
make 
fake
cake 
take 
sake 
seam 
mace.
acme 