Mud and Peat bog

Mud noun - Water soaked soil; soft wet earth.

Peat bog and mud are semantically related In some cases you can use "Peat bog" instead a noun "Mud".

Peat bog noun - Wet spongy ground of decomposing vegetation; has poorer drainage than a swamp; soil is unfit for cultivation but can be cut and dried and used for fuel.

Mud and peat bog are semantically related in swamp topic. Sometimes you can use "Mud" instead a noun phrase "Peat bog", if it concerns topics such as wet land covered with vegetation.