spark arrester vs sparker

spark arrester and sparker both are nouns.

Word	Noun	Adjective	Verb	Adverb
spark arrester	Yes	No	No	No
sparker	Yes	No	No	No

As nouns, spark arrester and sparker are synonyms defined as:

spark arrester and sparker: a wire net to stop sparks from an open fireplace or smokestack

spark arrester (noun)	sparker (noun)
a wire net to stop sparks from an open fireplace or smokestack	a wire net to stop sparks from an open fireplace or smokestack
electrical device to reduce sparking when electrical contacts are opened or closed