adsorption vs surface assimilation

adsorption and surface assimilation both are nouns.

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

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

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

adsorption (noun)	surface assimilation (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