Wax is related to Grease in the same way as Milk is related to

Soap is related to Wash in the same way as Broom is related to

Choose the correct alternative for the given relation.

Researcher : Historian : Scholar

Choose the correct alternative for the given relation.

Cattle : Herd : : Sheep : ?

Infestation is to Food as Infection is to.......?

Amorphousness is to definition as lassitude is to..........