labor camp vs labour camp

labor camp and labour camp both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor camp	Yes	No	No	No
labour camp	Yes	No	No	No

As nouns, labor camp and labour camp are synonyms defined as:

labor camp and labour camp: a penal institution for political prisoners who are used as forced labor

labor camp (noun)	labour camp (noun)
a penal institution for political prisoners who are used as forced labor	a penal institution for political prisoners who are used as forced labor