labour-intensive vs labor-intensive

labour-intensive and labor-intensive both are adjectives.

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

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

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

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