Curling iron and Pair of pliers

Curling iron noun - A cylindrical metal home appliance that heats a lock of hair that has been curled around it.

Pair of pliers and curling iron are semantically related. In some cases you can use "Pair of pliers" instead a noun phrase "Curling iron".

Pair of pliers noun - A gripping hand tool with two hinged arms and (usually) serrated jaws.

Curling iron and pair of pliers are semantically related. You can use "Curling iron" instead a noun phrase "Pair of pliers".