paramilitary organisation vs paramilitary organization

paramilitary organisation and paramilitary organization both are nouns.

Word	Noun	Adjective	Verb	Adverb
paramilitary organisation	Yes	No	No	No
paramilitary organization	Yes	No	No	No

As nouns, paramilitary organisation and paramilitary organization are synonyms defined as:

paramilitary organisation and paramilitary organization: a group of civilians organized in a military fashion (especially to operate in place of or to assist regular army troops)

Other synonyms of paramilitary organisation include paramilitary, paramilitary force, paramilitary unit.

paramilitary organisation (noun)	paramilitary organization (noun)
a group of civilians organized in a military fashion (especially to operate in place of or to assist regular army troops)	a group of civilians organized in a military fashion (especially to operate in place of or to assist regular army troops)