fly sheet vs rainfly

fly sheet and rainfly both are nouns.

Word	Noun	Adjective	Verb	Adverb
fly sheet	Yes	No	No	No
rainfly	Yes	No	No	No

As nouns, fly sheet and rainfly are synonyms defined as:

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

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

fly sheet (noun)	rainfly (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