surface assimilation vs adsorption

surface assimilation and adsorption both are nouns.

Word	Noun	Adjective	Verb	Adverb
surface assimilation	Yes	No	No	No
adsorption	Yes	No	No	No

As nouns, surface assimilation and adsorption are synonyms defined as:

surface assimilation and adsorption: the accumulation of molecules of a gas to form a thin film on the surface of a solid

surface assimilation (noun)	adsorption (noun)
the accumulation of molecules of a gas to form a thin film on the surface of a solid	the accumulation of molecules of a gas to form a thin film on the surface of a solid