In chiefly us lang=en terms the difference between kook and kookish
is that kook is an eccentric, strange or crazy person; a weirdo while kookish is like a kook; eccentric.
As a noun kook
is an eccentric, strange or crazy person; a weirdo.
As an adjective kookish is
like a kook; eccentric.
kook
English
Noun
(
en noun)
(slang, chiefly, US) An eccentric, strange or crazy person; a weirdo.
A board sport participant who has poor style or skill.
Derived terms
* kookology
* kooky
kookish
English
Adjective
(
en adjective)
(slang, chiefly, US) Like a kook; eccentric.
Derived terms
* kookishness