neighbourliness vs neighborliness

neighbourliness and neighborliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
neighbourliness	Yes	No	No	No
neighborliness	Yes	No	No	No

As nouns, neighbourliness and neighborliness are synonyms defined as:

neighbourliness and neighborliness: a disposition to be friendly and helpful to neighbors

Other synonyms of neighbourliness include good-neighborliness, good-neighbourliness.

neighbourliness (noun)	neighborliness (noun)
a disposition to be friendly and helpful to neighbors	a disposition to be friendly and helpful to neighbors