Rainfly and Tent-fly

Rainfly noun - Flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent.

Tent-fly is a synonym for rainfly. In some cases you can use "Tent-fly" instead a noun "Rainfly".

Tent-fly noun - Flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent.

Rainfly is a synonym for tent-fly. You can use "Rainfly" instead a noun phrase "Tent-fly".