line organisation vs line organization

line organisation and line organization both are nouns.

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

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

line organisation and line organization: the organizational structure of activities contributing directly to the organization's output

line organisation (noun)	line organization (noun)
the organizational structure of activities contributing directly to the organization's output	the organizational structure of activities contributing directly to the organization's output