interpenetration vs permeation

interpenetration and permeation both are nouns.

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

As nouns, interpenetration and permeation are synonyms defined as:

interpenetration and permeation: mutual penetration; diffusion of each through the other

interpenetration (noun)	permeation (noun)
mutual penetration; diffusion of each through the other	mutual penetration; diffusion of each through the other
the action of penetrating between or among	the process of permeating or infusing something with a substance