noun, noun or participle which takes 'suru', transitive verb, noun which may take the genitive case particle 'no'
passionate love; devotion
Intense, deep affection, often romantic but can also describe fervent dedication to a cause, hobby, or person.
彼は彼女に熱愛の気持ちを伝えた。
He conveyed his feelings of passionate love to her.
彼は仕事
He is devoted to his work.