redeye flight vs redeye

redeye flight and redeye both are nouns.

Word	Noun	Adjective	Verb	Adverb
redeye flight	Yes	No	No	No
redeye	Yes	No	No	No

As nouns, redeye flight and redeye are synonyms defined as:

redeye flight and redeye: a night flight from which the passengers emerge with eyes red from lack of sleep

redeye flight (noun)	redeye (noun)
a night flight from which the passengers emerge with eyes red from lack of sleep	a night flight from which the passengers emerge with eyes red from lack of sleep