Question

four abstract noun related to child labour

Answer 1

labour, sorrow, sadness and harassment

Answer 2

Four abstract noun related to child labour are: manual-labour, employment, exploitation, cruelty.

All these four words are abstract noun in a way that they are somehow related to child labour.

Child labour is always about manual labour; it is a way of employment, engaging a child labour is like an exploitation, and it is a deed of cruelty to employ a child as a slave.