As nouns the difference between secessionist and copperheadism
is that secessionist is a person who secedes or supports secession from a political union or an alliance or organisation while copperheadism is (us|historical) the state of being a copperhead; sympathy in the north for southern secessionists during the american civil war.
As an adjective secessionist
is seceding or supporting secession.
secessionist
English
Noun
(
en noun)
A person who secedes or supports secession from a political union or an alliance or organisation.
:Gustav Klimt was of the school .
Usage notes
A common usage is for supporters of the Confederacy during the United States Civil War.
Related terms
*secede
*secession
Usage notes
As well as being applied to people and movements, 'secessionist' is commonly used to describe opinions or beliefs and the form of their expression in books, articles, or speeches.
copperheadism
English
Noun
(-)
(US, historical) The state of being a Copperhead; sympathy in the North for Southern secessionists during the American Civil War.
*1988 , James McPherson, Battle Cry of Freedom , Oxford 2003, p. 247:
*:The project went nowhere, but it did plant seeds of copperheadism that germinated a couple of years later.