reflection factor vs reflectivity

reflection factor and reflectivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
reflection factor	Yes	No	No	No
reflectivity	Yes	No	No	No

As nouns, reflection factor and reflectivity are synonyms defined as:

reflection factor and reflectivity: the fraction of radiant energy that is reflected from a surface

Other synonyms of reflection factor include coefficient of reflection, reflectance.

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