fire hydrant vs fireplug

fire hydrant and fireplug both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire hydrant	Yes	No	No	No
fireplug	Yes	No	No	No

As nouns, fire hydrant and fireplug are synonyms defined as:

fire hydrant and fireplug: an upright hydrant for drawing water to use in fighting a fire

Other synonyms of fire hydrant include plug.

fire hydrant (noun)	fireplug (noun)
an upright hydrant for drawing water to use in fighting a fire	an upright hydrant for drawing water to use in fighting a fire