| Answer | Crossword Clue |
|---|---|
| REEF | Coral structure |
| ATOLL | Coral structure |
| REEF | Coral-encrusted structure |
| ATOLL | Coral reef structure |
| coralline | composed of coral or having the structure of coral |
| polypidom | a coral, or corallum; also, one of the coral-like structure made by bryozoans and hydroids |
| polypidoms | POLYPIDOM, a coral, or corallum; also, one of the coral-like structure made by bryozoans and hydroids |
