night-sight vs twilight vision

night-sight and twilight vision both are nouns.

Word	Noun	Adjective	Verb	Adverb
night-sight	Yes	No	No	No
twilight vision	Yes	No	No	No

As nouns, night-sight and twilight vision are synonyms defined as:

night-sight and twilight vision: the ability to see in reduced illumination (as in moonlight)

Other synonyms of night-sight include night vision, scotopic vision.

night-sight (noun)	twilight vision (noun)
the ability to see in reduced illumination (as in moonlight)	the ability to see in reduced illumination (as in moonlight)