rainfly vs tent-fly

rainfly and tent-fly both are nouns.

Word	Noun	Adjective	Verb	Adverb
rainfly	Yes	No	No	No
tent-fly	Yes	No	No	No

As nouns, rainfly and tent-fly are synonyms defined as:

rainfly and tent-fly: flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent

Other synonyms of rainfly include fly, fly sheet, tent flap.

rainfly (noun)	tent-fly (noun)
flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent	flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent