redeye vs redeye flight

redeye and redeye flight both are nouns.

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

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

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

redeye (noun)	redeye flight (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