sere
Arid is another word for extremely dry.
There are two words that fit your search....Dune or Wash.
I would guess, "arid"?
"Sere" means dry, arid, withered.
The word heart is another four-letter word that is related to your circulatory system.
Dry.
'Cans' is another word for 'tins'.
door?
over
sawn
west?
door