This is the 4740th most frequent Japanese word.
来月
Next month.
'来月' is used as a time expression to indicate the time frame 'next month'.
来月、旅行に行きます。
Next month, I will go on a trip.
Here, '来月' serves as the subject of the sentence, referring to the general timeframe 'next month'.
来月は忙しいです。
Next month will be busy.
In this context, '来月' modifies '予定' (schedule), specifying plans or schedules for 'next month'.