1. Insect-Worm(Common Noun-Common) Corals are skeletal remains of marine organisms from the class Anthozoa and exist as small sea anemone–like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.

Related Idea:

a. Common Noun-Neuter: coral reefপ্ৰবাল প্ৰাচীৰ...
b. Material Noun-Neuter: coral beadপোৱালমণিবিদ্যুম...