The doctor advised him to stay at home for a few days to aid his recuperation.

recuperation 是名词，来自动词 recuperate（恢复健康）。词根 recuper- 来自拉丁语，表示"重新获得、恢复"，后缀 -ation 表示动作或状态。recuperation 指"（病后或受伤后的）恢复过程"。