rainfly vs tent flap

rainfly and tent flap both are nouns.

Word	Noun	Adjective	Verb	Adverb
rainfly	Yes	No	No	No
tent flap	Yes	No	No	No

As nouns, rainfly and tent flap are synonyms defined as:

rainfly and tent flap: 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-fly.

rainfly (noun)	tent flap (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