tongs vs fire tongs

tongs and fire tongs both are nouns.

Word	Noun	Adjective	Verb	Adverb
tongs	Yes	No	No	No
fire tongs	Yes	No	No	No

As nouns, fire tongs is a hyponym of tongs; that is, fire tongs is a word with a more specific, narrower meaning than tongs:

tongs: any of various devices for taking hold of objects; usually have two hinged legs with handles above and pointed hooks below
fire tongs: tongs for taking hold of burning coals

Other hyponyms of tongs include coal tongs, ice tongs.

tongs (noun)	fire tongs (noun)
any of various devices for taking hold of objects; usually have two hinged legs with handles above and pointed hooks below	tongs for taking hold of burning coals