fireguard vs fire screen

fireguard and fire screen both are nouns.

Word	Noun	Adjective	Verb	Adverb
fireguard	Yes	No	No	No
fire screen	Yes	No	No	No

As nouns, fireguard and fire screen are synonyms defined as:

fireguard and fire screen: a metal screen before an open fire for protection (especially against flying sparks)

fireguard (noun)	fire screen (noun)
a metal screen before an open fire for protection (especially against flying sparks)	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