night-sight vs night vision

night-sight and night vision both are nouns.

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

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

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

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

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