permeation vs pervasion

permeation and pervasion both are nouns.

Word	Noun	Adjective	Verb	Adverb
permeation	Yes	No	No	No
pervasion	Yes	No	No	No

As nouns, permeation and pervasion are synonyms defined as:

permeation and pervasion: the process of permeating or infusing something with a substance

Other synonyms of permeation include suffusion.

permeation (noun)	pervasion (noun)
mutual penetration; diffusion of each through the other	the process of permeating or infusing something with a substance
the process of permeating or infusing something with a substance