Fenland and Mud

Fenland noun - Low-lying wet land with grassy vegetation; usually is a transition zone between land and water.

Mud and fenland are semantically related. In some cases you can use "Mud" instead a noun "Fenland".

Mud noun - Water soaked soil; soft wet earth.

Fenland and mud are semantically related. Sometimes you can use "Fenland" instead a noun "Mud".