reflection factor vs coefficient of reflection

reflection factor and coefficient of reflection both are nouns.

Word	Noun	Adjective	Verb	Adverb
reflection factor	Yes	No	No	No
coefficient of reflection	Yes	No	No	No

As nouns, reflection factor and coefficient of reflection are synonyms defined as:

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

Other synonyms of reflection factor include reflectance, reflectivity.

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