reflectance vs reflection factor

reflectance and reflection factor both are nouns.

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

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

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

Other synonyms of reflectance include coefficient of reflection, reflectivity.

reflectance (noun)	reflection factor (noun)
the fraction of radiant energy that is reflected from a surface	the fraction of radiant energy that is reflected from a surface