Homework and Spadework

Homework noun - Preparatory school work done outside school (especially at home).

Spadework and homework are semantically related In some cases you can use "Spadework" instead a noun "Homework".

Spadework noun - Dull or routine preliminary work preparing for an undertaking.

Homework and spadework are semantically related in preliminary work topic. You can use "Homework" instead a noun "Spadework".