fireplug vs fire hydrant

fireplug and fire hydrant both are nouns.

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

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

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

Other synonyms of fireplug include plug.

fireplug (noun)	fire hydrant (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