Fire tongs and Pair of tongs

Fire tongs noun - Tongs for taking hold of burning coals.

Pair of tongs and fire tongs are semantically related. In some cases you can use "Pair of tongs" instead a noun phrase "Fire tongs".

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

Fire tongs and pair of tongs are semantically related. Sometimes you can replace phrase "Fire tongs" with "Pair of tongs", this phrases are similar.