General:
* Section: This is a good general synonym, often used for a part of a written work.
* Part: Another general synonym, similar to "section".
* Portion: Similar to "section" and "part", but emphasizes a specific part.
Specific contexts:
* For a written work:
* Paragraph: For a specific section of writing.
* Chapter: For a larger section of a book.
* For travel:
* Journey: Emphasizes the movement or travel.
* Trip: Similar to "journey", but shorter and less formal.
* Voyage: For a long journey by sea.
* For time:
* Period: For a specific length of time.
* For a law:
* Clause: For a specific part of a law.
* For a channel:
* Channel: For a waterway or passage.
To get the best synonym, consider the specific context in which you are using the word "passage."