kook

As nouns the difference between book and kook

is that book is book while kook is kitchen.

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.