In slang|chiefly|us|lang=en terms the difference between kookishness and kookery
is that kookishness is (slang|chiefly|us) the state or condition of being kookish; eccentricity, weirdness while kookery is (slang|chiefly|us) kookishness.
As nouns the difference between kookishness and kookery
is that kookishness is (slang|chiefly|us) the state or condition of being kookish; eccentricity, weirdness while kookery is (slang|chiefly|us) kookishness.
kookishness
English
Noun
(-)
(slang, chiefly, US) The state or condition of being kookish; eccentricity, weirdness. kookery
English
Noun
(en-noun)
(slang, chiefly, US) kookishness