addlebrain
addlehead
addlepate
beefhead
blockhead
blubberhead
blunderer
bonehead
boor
botcher
bufflehead
bumbler
bungler
cabbagehead
chowderhead
chucklehead
clod
clodhead
clodhopper
clodknocker
clodpate
clodpoll
clot
clown
dolt
dolthead
dullhead
dumbhead
dunderhead
dunderpate
fathead
fool
fumbler
gawk
gowk
jolterhead
jughead
klutz
knucklehead
looby
lout
lubber
lunkhead
meathead
muddlehead
mushhead
muttonhead
noodlehead
numskull
oaf