(n)fireplace, hearth, open fireplacean open recess in a wall at the base of a chimney where a fire can be built“the fireplace was so large you could walk inside it”, “he laid a fire in the hearth and lit it”, “the hearth was black with the charcoal of many fires”
(n)hearth, firesidean area near a fireplace (usually paved and extending out into a room)“they sat on the hearth and warmed themselves before the fire”