This is the 7822nd most frequent Japanese word.
和ま
"和ま" (nagoma) means "harmony" or "peace of mind."
In this sentence, '和やかな' (nagoyaka-na) is used as an adjective stemming from '和ま' (nagoma), meaning 'peaceful' or 'harmonious', to describe a serene state of mind.
心の中に和やかな気持ちが広がる。
A feeling of tranquility spreads within my heart.
Here, '和ます' (nagomasu) is used as a verb derived from '和ま', indicating the action of calming or soothing someone.
部屋の装飾が訪問者を和ませる。
The decorations in the room soothe the visitors.
In this example, the verb '和まされる' (nagomasareru) in passive form suggests the subject is calmed or pacified by another's action.