addlebrain
addlehead
addlepate
beefhead
blockhead
blubberhead
blunderhead
bonehead
bufflehead
cabbagehead
chowderhead
chucklehead
clodhead
clodpate
clodpoll
dabbler
dilettante
dolthead
dullhead
dumbhead
dunce
dunderhead
dunderpate
fathead
fool
greenhorn
greeny
ignoramus
illiterate
illiterati
jolterhead
jughead
know-nothing
knucklehead
lowbrow
lunkhead
meathead
middlebrow
muddlehead
mushhead
muttonhead
no scholar
noodlehead
numskull
peabrain
pinbrain
pinhead
pumpkin head
puzzlehead
stupidhead