hearth vs fireplace

hearth and fireplace both are nouns.

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

As nouns, hearth and fireplace are synonyms defined as:

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

Other synonyms of hearth include open fireplace.

hearth (noun)	fireplace (noun)
home symbolized as a part of the fireplace	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
an area near a fireplace (usually paved and extending out into a room)