labor-intensive vs labour-intensive

labor-intensive and labour-intensive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
labor-intensive	No	Yes	No	No
labour-intensive	No	Yes	No	No

As adjectives, labor-intensive and labour-intensive are synonyms defined as:

labor-intensive and labour-intensive: requiring a large expenditure of labor but not much capital

labor-intensive (adjective)	labour-intensive (adjective)
requiring a large expenditure of labor but not much capital	requiring a large expenditure of labor but not much capital