reflectivity vs reflectiveness

reflectivity and reflectiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
reflectivity	Yes	No	No	No
reflectiveness	Yes	No	No	No

As nouns, reflectivity and reflectiveness are synonyms defined as:

reflectivity and reflectiveness: the capability of quiet thought or contemplation

reflectivity (noun)	reflectiveness (noun)
the ability to reflect beams or rays	the capability of quiet thought or contemplation
the capability of quiet thought or contemplation
the fraction of radiant energy that is reflected from a surface