"Kidner" is quite a unique word, but it has a few synonyms that can be used in its place. One of the most common synonyms for it is "kind-hearted," which means being warm, compassionate, and benevolent towards others. Another synonym for "kidner" is "generous," a word that refers to being giving and liberal towards others. Furthermore, "compassionate," "sympathetic," and "empathetic" are also alternatives that capture the same sentiment as "kidner," indicating an individual who is caring and considerate of others. In essence, while "kidner" may not have many synonyms, the words mentioned above can substitute it in various contexts.