open fireplace vs fireplace

open fireplace and fireplace both are nouns.

Word	Noun	Adjective	Verb	Adverb
open fireplace	Yes	No	No	No
fireplace	Yes	No	No	No

As nouns, open fireplace and fireplace are synonyms defined as:

open fireplace and fireplace: an open recess in a wall at the base of a chimney where a fire can be built

Other synonyms of open fireplace include hearth.

open fireplace (noun)	fireplace (noun)
an open recess in a wall at the base of a chimney where a fire can be built	an open recess in a wall at the base of a chimney where a fire can be built