schedule/timetable/agenda/itinerary
schedule
名詞：進度表、計劃表
場景：My schedule for next month is very tight. 我下個月的行程很緊湊。
動詞：排定
場景：The class has been rescheduled for tomorrow evening. 已改成明天傍晚上課。、
※schedule也可以表示時刻表，例如，flight schedule 航班時刻表、bus schedule 公車時刻表。
timetable
名詞：時間表
場景：To make things run smoothly, I've made a timetable for the project.
備註：timetable其實跟schedule（時刻表）意思一樣，隻是schedule重行程細節，timetable重時間。根據劍橋字典，美國人比較常用schedule，英國人比較常用timetable。
agenda
名詞：會議議程
場景：
- Has you received a copy of the agenda for next week's meeting? 你有收到下周會議的議程嗎？
- There are several important items on the agenda for discussion today. 今天的議程上有幾個重點項目要討論。
- be high on the agenda 意思是首要、重要議題
itinerary
名詞：旅遊行程、出差行程（上面通常會註明交通、住宿及景點介紹）
場景：National Palace Museum is on most tourists' itinerary when visiting Taipei. 故宮博物館是多數人來臺北玩必去的旅遊行程。
schedule:
- a list of planned activities or things to be done showing the times or dates when they are intended to happen or be done
- a list of the times when events are planned to happen, for example the times when classes happen or when buses, etc. leave and arrive
timetable:
- a detailed plan showing when events or activities will happen.
- a list of the times when buses, trains, and planes leave and arrive
- a list of the times when classes in school happen
agenda: a list of matters to be discussed at a meeting.
itinerary: a detailed plan or route of a journey.