As nouns the difference between psis and pais
is that psis is while pais is village.
psis
English
Noun
(head)
----
pais
English
Noun
(-)
(obsolete, legal) The (people of the) country.
Usage notes
* A
trial per pais'' is a trial by the country, i.e. by a jury; and ''matter in pais is matter triable by the country, or jury.
(
Webster 1913)
----