firefly vs fire beetle

firefly and fire beetle both are nouns.

Word	Noun	Adjective	Verb	Adverb
firefly	Yes	No	No	No
fire beetle	Yes	No	No	No

As nouns, firefly and fire beetle are synonyms defined as:

firefly and fire beetle: tropical American click beetle having bright luminous spots

Other synonyms of firefly include Pyrophorus noctiluca.

firefly (noun)	fire beetle (noun)
nocturnal beetle common in warm regions having luminescent abdominal organs	tropical American click beetle having bright luminous spots
tropical American click beetle having bright luminous spots