absorption factor vs absorptivity

absorption factor and absorptivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
absorption factor	Yes	No	No	No
absorptivity	Yes	No	No	No

As nouns, absorption factor and absorptivity are synonyms defined as:

absorption factor and absorptivity: (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body

absorption factor (noun)	absorptivity (noun)
(physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body	(physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body