If you are referring to the plant:
* Sedges: This is a very close synonym, as both rushes and sedges are types of grass-like plants.
* Reeds: This is a broader term, as reeds can include other types of plants besides rushes.
* Cattails: These are tall, cylindrical plants that resemble rushes, but have a different shape and texture.
If you are referring to the action of rushing:
* Hurries: This implies a sense of urgency and haste.
* Dashes: This implies a sudden and forceful movement.
* Speeds: This emphasizes the speed of the movement.
* Charges: This suggests a forceful and energetic movement.
* Bustles: This suggests a lot of activity and movement.
If you are referring to the editing process of film or video:
* Rough cuts: This refers to the early, unpolished version of a film or video.
* Dailies: This refers to the raw footage that is shot each day.
In other contexts, the best synonym might be:
* Hasten: This emphasizes the speed of the movement.
* Rush hour: This refers to a period of time when there is a lot of traffic.
* Rush job: This refers to a task that needs to be completed quickly.
To give you the best synonym, please tell me the context in which you are using the word "rushes."