chromatic vision vs trichromacy

chromatic vision and trichromacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
chromatic vision	Yes	No	No	No
trichromacy	Yes	No	No	No

As nouns, chromatic vision and trichromacy are synonyms defined as:

Other synonyms of chromatic vision include color vision.

chromatic vision (noun)	trichromacy (noun)
the normal ability to see colors	the normal ability to see colors