Compost heap and Shell mound

Compost heap noun - A heap of manure and vegetation and other organic residues that are decaying to become compost.

Shell mound and compost heap are semantically related In some cases you can use "Shell mound" instead a noun phrase "Compost heap".

Compost heap and shell mound are semantically related in refuse heap topic. You can use "Compost heap" instead a noun phrase "Shell mound".