Pair of pliers and Tongs

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

Tongs and pair of pliers are semantically related. In some cases you can use "Tongs" instead a noun phrase "Pair of pliers".

Tongs noun - Any of various devices for taking hold of objects; usually have two hinged legs with handles above and pointed hooks below.

Pair of pliers and tongs are semantically related. You can use "Pair of pliers" instead a noun "Tongs".