fireguard vs firebreak

fireguard and firebreak both are nouns.

Word	Noun	Adjective	Verb	Adverb
fireguard	Yes	No	No	No
firebreak	Yes	No	No	No

As nouns, fireguard and firebreak are synonyms defined as:

fireguard and firebreak: a narrow field that has been cleared to check the spread of a prairie fire or forest fire

fireguard (noun)	firebreak (noun)
a metal screen before an open fire for protection (especially against flying sparks)	a narrow field that has been cleared to check the spread of a prairie fire or forest fire
a narrow field that has been cleared to check the spread of a prairie fire or forest fire