This is the 9279th most frequent Japanese word.
療養
"Recuperation" or "medical treatment for recovery."
Here, 療養 refers to the process or act of resting and healing for health improvement.
彼は療養のために山の近くの静かな場所へ行きました。
He went to a quiet place near the mountains for recuperation.
Here, 療養 is used to describe the requirement of medical care and rest over a prolonged period.
病院で長期療養が必要だと言われました。
He was told that long-term recuperation in the hospital is necessary.
In this case, 療養 indicates the period during which a person is recovering or undergoing restorative treatment.