labor

Sense 1 noun

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

there is a shortage of skilled labor in this field

Sense 2 verb

strive and make an effort to reach a goal

She tugged for years to make a decent living

Sense 3 noun

productive work (especially physical work done for wages)

his labor did not require a great deal of skill

Sense 4 verb

work hard

She was digging away at her math homework

Sense 5 noun

concluding state of pregnancy; from the onset of contractions to the birth of a child

she was in labor for six hours

Sense 6 verb

undergo the efforts of childbirth

Sense 7 noun

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

Sense 8 noun

any piece of work that is undertaken or attempted

he prepared for great undertakings