pinhead

nouns

an ignorant or foolish person
boob, booby, dope, dumbbell, dummy, pinhead
the head of a pin
pinhead
is a part of
a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
pin
is a type of (narrower)
a projection out from one end
"the head of the nail", "a pinhead is the head of a pin"
head