This is the 8248th most frequent Japanese word.
幸福
Happiness; well-being; blessedness.
In this sentence, "幸福" (happiness) is used as an adjective in its adjective form "幸福な" to describe the nature of his life.
彼は幸福な人生を送っています。
He leads a happy life.
Here, "幸福" is used as a noun paired with "健康" (health), highlighting essential elements in life.
健康と幸福は人生において重要です。
Health and happiness are important in life.
In this case, "幸福" serves as a direct object for the verb "感じる" (to feel), focusing on personal experiences of happiness.