Dunce's cap and Lid

Dunce's cap noun - A cone-shaped paper hat formerly placed on the head of slow or lazy pupils.

Lid and dunce's cap are semantically related. In some cases you can use "Lid" instead a noun phrase "Dunce's cap".

Lid noun - A piece placed over an open container to hold in, protect, or conceal its contents.

Dunce's cap and lid are semantically related. Sometimes you can replace phrase "Dunce's cap" with "Lid", this terms are similar.