How are a hydraulic motor and hydraulic pump similar?

A hydraulic motor uses hydraulic pressure to drive it. Simplest hydraulic motor is a water wheel which uses a directed water stream to move it. Hydraulic motors are used to operate other equipment directly.

A hydraulic pump on the other hand is used to move hydraulic fluid for use elsewhere. Hydraulic pumps are powered by motors or engines and are not used to operate other equipment directly. Internally pumps and motors are quite different and cannot typically be interchanged.