labour vs labor

labour and labor both are nouns.

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

As nouns, labour and labor are synonyms defined as:

labour and labor: productive work (especially physical work done for wages)

Other synonyms of labour include toil.

As nouns, labour and labor are synonyms defined as:

Other synonyms of labour include project, task, undertaking.

As nouns, labour and labor are synonyms defined as:

labour and labor: a social class comprising those who do manual labor or work for wages

Other synonyms of labour include proletariat, working class.

As nouns, labour and labor are synonyms defined as:

labour and labor: an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement

Other synonyms of labour include labor movement, trade union movement.

As nouns, labour and labor are synonyms defined as:

labour and labor: concluding state of pregnancy; from the onset of contractions to the birth of a child

Other synonyms of labour include childbed, confinement, lying-in, parturiency, travail.

As verbs, labour and labor are synonyms defined as:

As verbs, labour and labor are synonyms defined as:

Other synonyms of labour include dig, drudge, fag, grind, moil, toil, travail.

As verbs, labour and labor are synonyms defined as:

Other synonyms of labour include drive, push, tug.

labour (noun)	labor (noun)
productive work (especially physical work done for wages)	productive work (especially physical work done for wages)
any piece of work that is undertaken or attempted	any piece of work that is undertaken or attempted
a social class comprising those who do manual labor or work for wages	a social class comprising those who do manual labor or work for wages
an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement	an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement
concluding state of pregnancy; from the onset of contractions to the birth of a child	concluding state of pregnancy; from the onset of contractions to the birth of a child

labour (verb)	labor (verb)
undergo the efforts of childbirth	undergo the efforts of childbirth
work hard	work hard
strive and make an effort to reach a goal	strive and make an effort to reach a goal