Grot and Sludge

Grot noun - A naturally formed underground chamber with an opening to the surface.

Sludge and grot are semantically related In some cases you can use "Sludge" instead a noun "Grot".

Sludge noun - Soft wet earth.

Grot and sludge are semantically related (British) in gunge topic. Sometimes you can use "Grot" instead a noun "Sludge". informal substitute

Nearby Words: sludgy, sludging