“kind”和“kindness” 的区别：
意思
kind [[kʌɪnd]：n.种类；adj.亲切友好的。
kindness [ˈkʌɪn(d)nəs]：n.好心，慷慨大方，体贴。
kind
n.
a group of people or things having similar characteristics: 种类.
[mass noun]character; nature: 特征；性质.
each of the elements (bread and wine) of the Eucharist: 圣餐的圣体（指面包或葡萄酒）.
adj.
having or showing a friendly, generous, and considerate nature: 亲切友好的.
used in a polite request
[predic.](kind to)(of a consumer product)gentle on (a part of the body): （消费品对人体）有益的，无害的.
archaic affectionate; loving:〈古〉 亲爱的；钟情的.
kindness
n.
the quality of being friendly, generous, and considerate: 好心；慷慨大方；体贴。
[count noun]a kind act: 善行，善举.
参考资料
搜狗翻译：https://fanyi.sogou.com/?keyword=kind&fr=websearch_submit&from=en&to=zh-CHS
搜狗翻译：https://fanyi.sogou.com/?keyword=kindness&fr=websearch_submit&from=en&to=zh-CHS