achromatism vs achromaticity

achromatism and achromaticity both are nouns.

Word	Noun	Adjective	Verb	Adverb
achromatism	Yes	No	No	No
achromaticity	Yes	No	No	No

As nouns, achromatism and achromaticity are synonyms defined as:

achromatism and achromaticity: the visual property of being without chromatic color

Other synonyms of achromatism include colorlessness, colourlessness.

achromatism (noun)	achromaticity (noun)
the visual property of being without chromatic color	the visual property of being without chromatic color